RFR: 8341097: GHA: Demote Mac x86 jobs to build only

[Aleksey Shipilev]

On Mon, 30 Sep 2024 08:36:38 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

Not now, bot. I'll probably delay this until the JDK 25 fork.

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PR Comment: https://git.openjdk.org/jdk/pull/21257#issuecomment-2459061482