Merge remote-tracking branch 'origin/release'

Merge branch 'balay/ci-osx-migrate-to-arm' into 'release'

CI: migrate osx-xsdk-opt to arm

See merge request petsc/petsc!8150

CI: migrate osx-xsdk-opt to arm

- remove --download-xsdk - its been removed long ago (and rename corresponding xsdk jobs)

- rename osx jobs to macos

- update MPI location to its real path.
(curre

CI: migrate osx-xsdk-opt to arm

- remove --download-xsdk - its been removed long ago (and rename corresponding xsdk jobs)

- rename osx jobs to macos

- update MPI location to its real path.
(currently listed path is a link to the real path - it helped with CI migration of those jobs
to newer xcode - while keeping other branch jobs working during/after the migration)

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