[jdk17u-dev] RFR: 8325194: GHA: Add macOS M1 testing [v3]

[George Adams]

> Now that macOS M1 executors are [available in GitHub actions](https://github.blog/changelog/2024-01-30-github-actions-introducing-the-new-m1-macos-runner-available-to-open-source/) it makes sense to move the build to run on M1 (rather than cross-compiled) and also enable testing on the platform.
> 
> Applies cleanly other than the following:
> 
> - `.github/actions/get-jtreg/action.yml` I also integrated https://github.com/openjdk/jdk/commit/3c91b59ef9c992718d73f2fc9fa50ad2ead78208 as it caused a regression in tip
> - `make/conf/github-actions.conf` having the obvious difference in version numbers for the boot JDK (I also took the liberty of reordering them to be consistent with tip)

George Adams has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:

 - Merge remote-tracking branch 'upstream/master' into macos14
 - Update action.yml
 - Backport d1c82156ba6ede4b798ac15f935289cfcc99d1a0
 - Merge remote-tracking branch 'upstream/master' into gtest
 - Backport ccf2f5837b31cddd24ec81f7f67107d9fc03c294
 - Backport 3e2314d08218dc8a4f4fc61bd4e1d5e58a0129c7

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

Changes: https://git.openjdk.org/jdk17u-dev/pull/2697/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2697&range=02
  Stats: 42 lines in 4 files changed: 29 ins; 5 del; 8 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2697.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2697/head:pull/2697

PR: https://git.openjdk.org/jdk17u-dev/pull/2697