Deactivate test run in 'run-all-unit-tests' module by default

Deactivate test run in 'run-all-unit-tests' module by default

There is a new Maven profile 'repeat-all-unit-tests', and the name
already implies what a comment in the Maven module explains like this:
ATTENTION: This profile is inactive by default, because when active and
running a full reactor build, it makes almost all tests run 2x, doubling
the build time without any added value. This Maven module only exists
for convenience: As a developer, your IDE can detect and run
'RunTheseBeforeYouCommitTests'. That way, you do not have to use Maven
and get the test results reported within the IDE's JUnit user interface.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>