RFR: 8370890: Start of release updates for JDK 27 [v10]

[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 21 additional commits since the last revision:

 - 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
 - Merge branch 'master' into start-of-release-27
 - Changes required for hard 80 character line limit
 - Update --release 26 symbol information for JDK 26 build 25
   The macOS/AArch64 build 25 was taken from https://jdk.java.net/26/
 - ... and 11 more: https://git.openjdk.org/jdk/compare/443e5643...8bbe15f2

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28130/files
  - new: https://git.openjdk.org/jdk/pull/28130/files/1237304b..8bbe15f2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28130&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28130&range=08-09

  Stats: 3514 lines in 111 files changed: 2399 ins; 621 del; 494 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