[jdk21u] RFR: 8325194: GHA: Add macOS M1 testing

Tue Feb 6 14:28:07 UTC 2024

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.

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Commit messages:
 - Backport d1c82156ba6ede4b798ac15f935289cfcc99d1a0

Changes: https://git.openjdk.org/jdk21u/pull/435/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=435&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325194
  Stats: 28 lines in 4 files changed: 18 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/jdk21u/pull/435.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/435/head:pull/435

PR: https://git.openjdk.org/jdk21u/pull/435