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

[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)

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Depends on: https://git.openjdk.org/jdk17u-dev/pull/2667

Commit messages:
 - Backport d1c82156ba6ede4b798ac15f935289cfcc99d1a0

Changes: https://git.openjdk.org/jdk17u-dev/pull/2697/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2697&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325194
  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