[jfx21u] RFR: 8324337: Cherry-pick WebKit 617.1 stabilization fixes

[Johan Vos]

8324337: Cherry-pick WebKit 617.1 stabilization fixes

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Commit messages:
 - Backport 52840a17dee6a92fb9b1f3ff1b314b0ae228b95f

Changes: https://git.openjdk.org/jfx21u/pull/51/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx21u&pr=51&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324337
  Stats: 1297 lines in 161 files changed: 752 ins; 111 del; 434 mod
  Patch: https://git.openjdk.org/jfx21u/pull/51.diff
  Fetch: git fetch https://git.openjdk.org/jfx21u.git pull/51/head:pull/51

PR: https://git.openjdk.org/jfx21u/pull/51