[Infra] Create common SPM-focused reusable workflow

[ncooke3]

Create a re-usable workflow for our spm jobs. This helps consolidate our Xcode/macos testing strategy for our spm jobs.

• Post-merge: Experiment with adding workflow dispatch trigger to spm reusable job
  • [Infra] Add support for manual dispatch to new re-usable SPM workflow #14759

#no-changelog

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[ncooke3]

Still debugging...

• crashlytics / spm / spm (macos-15, Xcode_16.2, catalyst) (pull_request) Failing after 12m
  Details
• inappmessaging / tests (iOS, Xcode_16.2) (pull_request) Failing after 294m
  Details

[paulb777]

This is great. Thanks!