RFR: 8268849: Update to 612.1 version of WebKit

[Ambarish Rapte]

Update JavaFX WebKit to GTK WebKit 2.32 (612.1).
There are two separate commits:
1. [commit](https://github.com/openjdk/jfx/commit/ed0baf5f23aed0d8aaa72645c8e03fde56d0f0cc) : includes only native changes
2. [commit](https://github.com/openjdk/jfx/commit/b024c16551be7d929fa1d927d3be8f0fc75a64c3) : includes non native changes

This is change is targeted for JavaFX 18, shall be integrated after fork.

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Commit messages:
 - non-native
 - native

Changes: https://git.openjdk.java.net/jfx/pull/560/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=560&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268849
  Stats: 286063 lines in 5711 files changed: 175178 ins; 68140 del; 42745 mod
  Patch: https://git.openjdk.java.net/jfx/pull/560.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/560/head:pull/560

PR: https://git.openjdk.java.net/jfx/pull/560