RFR: 8336332: Rework tests to avoid unrelated stderr output [v2]

[Andy Goryachev]

> This PR removes unrelated `stderr` output in the headful test logs by redirecting it to an in-memory buffer.  Exceptions found in the buffer can be checked against the expected list.
> 
> In the case when any mismatch is detected, whether the type or the number of exceptions of particular type, the accumulated buffer gets dumped to `stderr` (without failing the test).
> 
> ## How To
> 
> To redirect stderr and later check the exceptions, surround your code with
> 
> `ErrorLoggingUtility.suppressStderr()` and either `ErrorLoggingUtility.checkStderr()` or `ErrorLoggingUtility.checkAndRestoreStderr()`.
> 
> To simply undo redirection, without checking, call  `ErrorLoggingUtility.restoreStderr()`.
> 
> To add the check to all the tests in the file, one can call the above mentioned methods inside  `@BeforeEach` and `@AfterEach`.
> 
> ## Miscellaneous
> 
> For reviewers' convenience, the first commit contains the main change, the second fixes the misspelt name of the utility class, the rest are trivial.
> 
> ## Questions
> 
> - should we fail the current test with `Assertions.fail()` in case of a mismatch?

Andy Goryachev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - Merge remote-tracking branch 'origin/master' into 8336332.failed
 - whitespace
 - revert intentionally failing test
 - 2025
 - fixed utility class name
 - suppress stderr

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/1897/files
  - new: https://git.openjdk.org/jfx/pull/1897/files/dd43ce99..7b228d42

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1897&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1897&range=00-01

  Stats: 121318 lines in 711 files changed: 60981 ins; 23896 del; 36441 mod
  Patch: https://git.openjdk.org/jfx/pull/1897.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1897/head:pull/1897

PR: https://git.openjdk.org/jfx/pull/1897