RFR: 8341097: GHA: Demote Mac x86 jobs to build only [v3]

[Aleksey Shipilev]

On Tue, 10 Dec 2024 19:24:59 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> See the discussion in the bug. I think we can stop testing Mac x86 in GHA, leaving only the build jobs.
>> 
>> Additional testing:
>>  - [x] GHA passes
>
> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
> 
>  - Merge branch 'master' into JDK-8341097-gha-no-mac-intel
>  - Merge branch 'master' into JDK-8341097-gha-no-mac-intel
>  - Fix

Not anecdotally anymore: GHA now publishes richer Actions stats, should be at "Actions" in your personal fork. Here is mine, sorted by queue wait time last month. macos-x86 are the largest waiters, which IMO underlines the reality that macos-x86 workers are not in abundance. macos-aarch64 are also not great, but at least they match the current hardware that we want to test for.

![gha-top-waiters](https://github.com/user-attachments/assets/0dbc1afc-38e1-4e57-820f-e5d86fa72df6)

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PR Comment: https://git.openjdk.org/jdk/pull/21257#issuecomment-2545835707