8356560: GHA: Add Windows ARM64 testing

[Luigi96]

Now that Windows ARM64 executors are available in GitHub actions it makes sense to enable testing on the platform.

Information:

• https://github.blog/changelog/2025-04-14-windows-arm64-hosted-runners-now-available-in-public-preview/
• New installer hangs on clangarm64 msys2/setup-msys2#358 - Reason why we had to bump MSYS

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8356560: GHA: Add Windows ARM64 testing (Enhancement - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/25125/head:pull/25125
$ git checkout pull/25125

Update a local copy of the PR:
$ git checkout pull/25125
$ git pull https://git.openjdk.org/jdk.git pull/25125/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 25125

View PR using the GUI difftool:
$ git pr show -t 25125

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/25125.diff

[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[Luigi96]

/covered

[openjdk]

@Luigi96 The following label will be automatically applied to this pull request:

• build

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

[bridgekeeper]

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[openjdk]

@Luigi96 this pull request can not be integrated into master due to one or more merge conflicts. To resolve these merge conflicts and update this pull request you can run the following commands in the local repository for your personal fork:

git checkout windows-aarch64-testing
git fetch https://git.openjdk.org/jdk.git master
git merge FETCH_HEAD
# resolve conflicts and follow the instructions given by git merge
git commit -m "Merge master"
git push