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

[Aleksey Shipilev]

> 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

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Changes: https://git.openjdk.org/jdk/pull/21257/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21257&range=02
  Stats: 11 lines in 1 file changed: 0 ins; 11 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21257.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21257/head:pull/21257

PR: https://git.openjdk.org/jdk/pull/21257