RFR: 8336332: Rework tests to avoid unrelated stderr output [v5]

[Andy Goryachev]

> This PR removes unrelated `stderr` output in the headless 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` and the test fails.
> 
> ## How To
> 
> To redirect stderr and later check the exceptions, surround your code with
> 
> `OutputRedirect.suppressStderr()` and either `OutputRedirect.checkStderr()` or `OutputRedirect.checkAndRestoreStderr()` (ideally, in the `finally` block).
> 
> To simply undo redirection, without checking, call  `OutputRedirect.restoreStderr()`.
> 
> To add the check to all the tests in the file, one can call the above mentioned methods inside  `@BeforeEach` and `@AfterEach`.
> 
> ## Changes
> 
> - added `OutputRedirect` facility
> - fixed ErrorLoggingUtiltity name

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 21 additional commits since the last revision:

 - snapshot 1 test
 - Merge remote-tracking branch 'origin/master' into 8367567.expected
 - expected
 - single exit common
 - message
 - whitespace
 - launcher test
 - revert add exports
 - decouple logging
 - test.javafx.util
 - ... and 11 more: https://git.openjdk.org/jfx/compare/c381e291...98f60999

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1897/files
  - new: https://git.openjdk.org/jfx/pull/1897/files/12e0f6a7..98f60999

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1897&range=04
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1897&range=03-04

  Stats: 23516 lines in 205 files changed: 16622 ins; 2845 del; 4049 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