RFR: 8370890: Start of release updates for JDK 27 [v12]

[Nizar Benalla]

> Get JDK 27 underway.

Nizar Benalla 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 24 additional commits since the last revision:

 - Merge branch 'master' into start-of-release-27
 - fix jls 27 link
 - fix typo and add entry for 27
 - Merge branch 'master' into start-of-release-27
 - revert changes to avoid conflict
 - add 27 to the acceptable boot versions
 - Merge branch 'master' into start-of-release-27
 - problem list failing test
 - Merge branch 'master' into start-of-release-27
 - expand start of release documentation
 - ... and 14 more: https://git.openjdk.org/jdk/compare/0351ed87...444cc1c8

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28130/files
  - new: https://git.openjdk.org/jdk/pull/28130/files/4bf97a8a..444cc1c8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28130&range=11
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28130&range=10-11

  Stats: 819 lines in 34 files changed: 424 ins; 271 del; 124 mod
  Patch: https://git.openjdk.org/jdk/pull/28130.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28130/head:pull/28130

PR: https://git.openjdk.org/jdk/pull/28130