Merge branch 'master' into next

Merge branch 'master' into next

* master:
  searchForReuse might impact performance in large repositories
  Retry loose object read upon "Stale file handle" exception
  Ignore missing javadoc in test bundles
  Upgrade maven-dependency-plugin to 3.2.0
  Upgrade jacoco-maven-plugin to 0.8.7
  Upgrade maven-jxr-plugin to 3.1.1
  Fix garbage collection failing to delete pack file
  Fix PathSuffixFilter: can decide only on full paths
  Update jetty to 9.4.42.v20210604
  [sshd] Log the full KEX negotiation result
  [releng] japicmp: update last release version
  CONTRIBUTING: add explicit link to ECA
  CONTRIBUTING: Use standard markdown format
  Add Eclipse code of conduct and security policy

Change-Id: I9e31cb6e22f5398db6e220f71693e87475c598bd