8386092: Implement JEP: Deprecate the macOS/x64 Port for Removal

[vidmik]

Implementation of the JEP to deprecate the macOS/x64 port for removal. Note that the JEP is still in Submitted state. Meanwhile, I'm opening this PR for awareness and for your help reviewing the proposed changes.

In particular, I could use your help making sure the change to GHA (main.yml) does the right thing. The intention is to allow running macOS/x64 builds/tests, but to not include the port by default.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
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Integration blocker

 ⚠️ Title mismatch between PR and JBS for issue JDK-8386092

Issue

• JDK-8386092: Implement JEP ?: Deprecate the macOS/x64 Port for Removal (Sub-task - P4) ⚠️ Title mismatch between PR and JBS.

Reviewing

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$ git fetch https://git.openjdk.org/jdk.git pull/31684/head:pull/31684
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Update a local copy of the PR:
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$ git pull https://git.openjdk.org/jdk.git pull/31684/head

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$ git pr checkout 31684

View PR using the GUI difftool:
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Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/31684.diff

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[bridgekeeper]

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[mlbridge]

Webrevs

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