Reduce integration test overhead (#32475)

In profiling integration tests, I found a couple places where per-test
overhead could be reduced:

* Avoiding disk IO by synchronizing instead of deleting & copying test
Git repository data. This saves ~100ms per test on my machine
* When flushing queues in `PrintCurrentTest`, invoke `FlushWithContext`
in a parallel.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

16 files changed, 0 insertions, 51 deletions

diff --git a/modules/git/tests/repos/language_stats_repo/description b/modules/git/tests/repos/language_stats_repo/description
deleted file mode 100644
index 498b267a8c..0000000000
--- a/modules/git/tests/repos/language_stats_repo/description
+++ /dev/null
@@ -1 +0,0 @@
-Unnamed repository; edit this file 'description' to name the repository.
diff --git a/modules/git/tests/repos/language_stats_repo/info/exclude b/modules/git/tests/repos/language_stats_repo/info/exclude
deleted file mode 100644
index a5196d1be8..0000000000
--- a/modules/git/tests/repos/language_stats_repo/info/exclude
+++ /dev/null
@@ -1,6 +0,0 @@
-# git ls-files --others --exclude-from=.git/info/exclude
-# Lines that start with '#' are comments.
-# For a project mostly in C, the following would be a good set of
-# exclude patterns (uncomment them if you want to use them):
-# *.[oa]
-# *~
diff --git a/modules/git/tests/repos/repo1_bare/description b/modules/git/tests/repos/repo1_bare/description
deleted file mode 100644
index 498b267a8c..0000000000
--- a/modules/git/tests/repos/repo1_bare/description
+++ /dev/null
@@ -1 +0,0 @@
-Unnamed repository; edit this file 'description' to name the repository.
diff --git a/modules/git/tests/repos/repo1_bare/info/exclude b/modules/git/tests/repos/repo1_bare/info/exclude
deleted file mode 100644
index a5196d1be8..0000000000
--- a/modules/git/tests/repos/repo1_bare/info/exclude
+++ /dev/null
@@ -1,6 +0,0 @@
-# git ls-files --others --exclude-from=.git/info/exclude
-# Lines that start with '#' are comments.
-# For a project mostly in C, the following would be a good set of
-# exclude patterns (uncomment them if you want to use them):
-# *.[oa]
-# *~
diff --git a/modules/git/tests/repos/repo1_bare_sha256/description b/modules/git/tests/repos/repo1_bare_sha256/description
deleted file mode 100644
index 498b267a8c..0000000000
--- a/modules/git/tests/repos/repo1_bare_sha256/description
+++ /dev/null
@@ -1 +0,0 @@
-Unnamed repository; edit this file 'description' to name the repository.
diff --git a/modules/git/tests/repos/repo1_bare_sha256/info/exclude b/modules/git/tests/repos/repo1_bare_sha256/info/exclude
deleted file mode 100644
index a5196d1be8..0000000000
--- a/modules/git/tests/repos/repo1_bare_sha256/info/exclude
+++ /dev/null
@@ -1,6 +0,0 @@
-# git ls-files --others --exclude-from=.git/info/exclude
-# Lines that start with '#' are comments.
-# For a project mostly in C, the following would be a good set of
-# exclude patterns (uncomment them if you want to use them):
-# *.[oa]
-# *~
diff --git a/modules/git/tests/repos/repo2_empty/description b/modules/git/tests/repos/repo2_empty/description
deleted file mode 100644
index 498b267a8c..0000000000
--- a/modules/git/tests/repos/repo2_empty/description
+++ /dev/null
@@ -1 +0,0 @@
-Unnamed repository; edit this file 'description' to name the repository.
diff --git a/modules/git/tests/repos/repo2_empty/info/exclude b/modules/git/tests/repos/repo2_empty/info/exclude
deleted file mode 100644
index a5196d1be8..0000000000
--- a/modules/git/tests/repos/repo2_empty/info/exclude
+++ /dev/null
@@ -1,6 +0,0 @@
-# git ls-files --others --exclude-from=.git/info/exclude
-# Lines that start with '#' are comments.
-# For a project mostly in C, the following would be a good set of
-# exclude patterns (uncomment them if you want to use them):
-# *.[oa]
-# *~
diff --git a/modules/git/tests/repos/repo3_notes/description b/modules/git/tests/repos/repo3_notes/description
deleted file mode 100644
index 498b267a8c..0000000000
--- a/modules/git/tests/repos/repo3_notes/description
+++ /dev/null
@@ -1 +0,0 @@
-Unnamed repository; edit this file 'description' to name the repository.
diff --git a/modules/git/tests/repos/repo5_pulls/description b/modules/git/tests/repos/repo5_pulls/description
deleted file mode 100644
index 498b267a8c..0000000000
--- a/modules/git/tests/repos/repo5_pulls/description
+++ /dev/null
@@ -1 +0,0 @@
-Unnamed repository; edit this file 'description' to name the repository.
diff --git a/modules/git/tests/repos/repo5_pulls/info/exclude b/modules/git/tests/repos/repo5_pulls/info/exclude
deleted file mode 100644
index a5196d1be8..0000000000
--- a/modules/git/tests/repos/repo5_pulls/info/exclude
+++ /dev/null
@@ -1,6 +0,0 @@
-# git ls-files --others --exclude-from=.git/info/exclude
-# Lines that start with '#' are comments.
-# For a project mostly in C, the following would be a good set of
-# exclude patterns (uncomment them if you want to use them):
-# *.[oa]
-# *~
diff --git a/modules/git/tests/repos/repo5_pulls_sha256/description b/modules/git/tests/repos/repo5_pulls_sha256/description
deleted file mode 100644
index 498b267a8c..0000000000
--- a/modules/git/tests/repos/repo5_pulls_sha256/description
+++ /dev/null
@@ -1 +0,0 @@
-Unnamed repository; edit this file 'description' to name the repository.
diff --git a/modules/git/tests/repos/repo6_blame_sha256/description b/modules/git/tests/repos/repo6_blame_sha256/description
deleted file mode 100644
index 498b267a8c..0000000000
--- a/modules/git/tests/repos/repo6_blame_sha256/description
+++ /dev/null
@@ -1 +0,0 @@
-Unnamed repository; edit this file 'description' to name the repository.
diff --git a/modules/git/tests/repos/repo6_blame_sha256/info/exclude b/modules/git/tests/repos/repo6_blame_sha256/info/exclude
deleted file mode 100644
index a5196d1be8..0000000000
--- a/modules/git/tests/repos/repo6_blame_sha256/info/exclude
+++ /dev/null
@@ -1,6 +0,0 @@
-# git ls-files --others --exclude-from=.git/info/exclude
-# Lines that start with '#' are comments.
-# For a project mostly in C, the following would be a good set of
-# exclude patterns (uncomment them if you want to use them):
-# *.[oa]
-# *~
diff --git a/modules/git/tests/repos/repo6_merge_sha256/description b/modules/git/tests/repos/repo6_merge_sha256/description
deleted file mode 100644
index 498b267a8c..0000000000
--- a/modules/git/tests/repos/repo6_merge_sha256/description
+++ /dev/null
@@ -1 +0,0 @@
-Unnamed repository; edit this file 'description' to name the repository.
diff --git a/modules/git/tests/repos/repo6_merge_sha256/info/exclude b/modules/git/tests/repos/repo6_merge_sha256/info/exclude
deleted file mode 100644
index a5196d1be8..0000000000
--- a/modules/git/tests/repos/repo6_merge_sha256/info/exclude
+++ /dev/null
@@ -1,6 +0,0 @@
-# git ls-files --others --exclude-from=.git/info/exclude
-# Lines that start with '#' are comments.
-# For a project mostly in C, the following would be a good set of
-# exclude patterns (uncomment them if you want to use them):
-# *.[oa]
-# *~