Integrated: Merge jfx20

[Kevin Rushforth]

Merge `jfx20` into `master`. I fixed the expected merge conflict in `.jcheck/conf` by keeping the version from `master`, so that the JBS fix version correctly remains at `jfx21` in the `master` branch. Since the fix for JDK-8302470 was the only fix brought forward from `jfx20`, the next effect of this Merge is: no change to `master`. The only reason I am even doing this is to make the next time I do a sync easier.

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Commit messages:
 - Merge
 - 8302470: Change JBS version in .jcheck/conf to jfxNN[.0.MM]
 - 8290866: Apple Color Emoji turns gray after JavaFX version 18
 - Merge
 - 8301022: Video distortion is observed while playing youtube video
 - 8173321: TableView: Click on right trough has no effect when cell height is higher than viewport height
 - 8090647: Mnemonics : on windows we should cancel the underscore latch when an app loses focus.
 - 8302472: WebColorFieldSkin should use precompiled Pattern
 - 8284662: [Win][Accessibility][ListCell] Screen reader fails to read ListView/ComboBox item count if > 100
 - 8302684: Cherry-pick WebKit 615.1 stabilization fixes (2)
 - ... and 23 more: https://git.openjdk.org/jfx/compare/17ea0573...44577ec8

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/jfx/pull/1051/files
  Stats: 200237 lines in 5705 files changed: 119290 ins; 42123 del; 38824 mod
  Patch: https://git.openjdk.org/jfx/pull/1051.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/1051/head:pull/1051

PR: https://git.openjdk.org/jfx/pull/1051