[8.x](backport #5919) [CI] MacOS 15 testing #6081
Merged
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What does this PR do?
Adds MacOS 15 ARM tests unit tests for PRs and merge to release branches.
Makes MacOS 13 x86 tests run only on main and release branches
MacOS 14 is expected in a follow-up PR
Why is it important?
Checklist
./changelog/fragments
using the changelog toolDisruptive User Impact
How to test this PR locally
Related issues
Relates https://github.com/elastic/ingest-dev/issues/4038
Questions to ask yourself
This is an automatic backport of pull request #5919 done by [Mergify](https://mergify.com).