RFR: 8365515: Create release notes for JavaFX 25

[Kevin Rushforth]

This PR adds the release notes for the JavaFX 25 release. This will first go into master, and then be backported to the jfx25 branch so it will be available in that branch when JavaFX 25 is published (and from there also synced into the jfx25u repo).

The following filter was used to produce the list of issues fixed in JavaFX 25:

https://bugs.openjdk.org/issues/?filter=47140

Additionally, we had four issues with a `release-note=yes` label, which are included in the list of important changes, etc.

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Commit messages:
 - Removed bugs that were both introduced and fixed in jfx25
 - Escape literal `<br>` in issue title
 - 8365515: Create release notes for JavaFX 25

Changes: https://git.openjdk.org/jfx/pull/1871/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1871&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365515
  Stats: 155 lines in 1 file changed: 155 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1871.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1871/head:pull/1871

PR: https://git.openjdk.org/jfx/pull/1871