* pr/17557:
  Remove testsupport.assertj package

Closes gh-17557

See gh-17557

Closes gh-17562

Fixes gh-17555

Closes gh-17556

Closes gh-17264

Closes gh-17554

Closes gh-17553

* pr/17504:
  Polish "Add metrics support for idle jdbc connections"
  Add metrics support for idle jdbc connections

Closes gh-17504

See gh-17504

See gh-17504

Closes gh-17552

Previously, DeferredLinesWriter would collect MockMvc output from
every test that has executed. If a test eventually failed, the
output from every test up to including the one that had failed would
be output, rather than just the output for the test that has just
failed.

This commit clears the deferred lines after each test, thereby
ensuring that when a failure occurs only the lines from the failing
test are output.

Fixes gh-17551

* pr/17537:
  Polish "Add reference to amqp-rabbit-spring-boot-autoconfigure"
  Add reference to amqp-rabbit-spring-boot-autoconfigure

Closes gh-17537

See gh-17537

See gh-17537

Closes gh-17544

Closes gh-17547

Closes gh-17543

Closes gh-17546

Fixes gh-17545

Update `BuildInfoMojo` so that the time property now defaults to
`${session.request.startTime}` rather than the time the Mojo was
created. Also update javadoc to make it clear that any supplied
value will be passed to `Instant.parse`.

See gh-17390

* pr/17514:
  Polish "Add support for configuring Spring Session SaveMode"
  Add support for configuring Spring Session SaveMode

Closes gh-17514

See gh-17514

See gh-17514

* pr/17507:
  Update documentation to use JUnit Jupiter

Closes gh-17507

See gh-17507

* pr/17522:
  Remove obsolete checkstyle suppressions

Closes gh-17522

See gh-17522

* pr/17524:
  Polish testsupport.junit.platform package

Closes gh-17524

See gh-17524

Closes gh-17520

Closes gh-17381

This commit updates ConfigurationPropertiesScanRegistrar to apply the
same component scan filters than the ones applied on standard classpath
scanning.

As a result, configuration properties scanning is automatically disabled
in slice tests and can be included by an explicit import or a dedicated
TypeFilter implementation if necessary.

Closes gh-16659