Prevent aarch64Mac extended tests running on osx12 node

[andrew-m-leonard]

TC aarch64Mac extended some java_awt tests will not run on the TC osx12 node, so prevent from running on that node.

Test build: https://ci.adoptium.net/job/build-scripts/job/jobs/job/jdk21u/job/jdk21u-mac-aarch64-temurin/182/

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[adamfarley]

LGTM

[sophia-guo]

@andrew-m-leonard will you cherry pick this PR?