3aa2605fda
Prior to this series of commits, the Spring Framework build used a custom TestSourcesPlugin to share test utilities and fixtures between projects. This plugin served its purpose; however, it also had its drawbacks: - All test code was visible in all other (downstream) projects, and that made it too easy to introduce unnecessary coupling. For example, this made it more difficult to migrate to JUnit Jupiter. This commit addresses such issues by migrating to Gradle's first-class support for "Java test fixtures". - Having test fixture code in a dedicated source folder makes it readily apparent that the code is reused across the test suite. - The build is now much cleaner since projects explicitly declare that they rely on specific test fixtures of upstream projects. - Incremental builds are now much faster on average since downstream projects no longer have to be recompiled due to changes in tests in upstream projects. - Prior to these commits we effectively had around 20 test fixture dependencies. With these commits we effectively now have only 7 test fixture dependencies (i.e., projects that share test fixtures). Closes gh-23550
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