RFR: 8339570: Add Tidy build support for JDK tests

[Nizar Benalla]

Can I get a review for this patch that adds the necessary changes for local support of the `tidy` library.

The dependency can be retrieved by running `make/devkit/createTidyBundle.sh` on Linux and MacOs systems.

This dependency is primarily going to be used to test the generated documentation.

This patch is meant to be integrated before #21272.

Note: we need to be a very specific revision of `tidy` and cannot use any of the available artifacts, as older versions do not recognize some HTML 5 elements. 

TIA

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Commit messages:
 - Merge remote-tracking branch 'upstream/master' into tidy-local-build-support
 - (C)
 - 8339570: Add Tidy build support for JDK tests

Changes: https://git.openjdk.org/jdk/pull/21341/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21341&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339570
  Stats: 126 lines in 6 files changed: 123 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/21341.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21341/head:pull/21341

PR: https://git.openjdk.org/jdk/pull/21341