[Infra] Common cocoapods pod lib lint job

[ncooke3]

I'd like to refactor down our workflows to:

• consolidate where we are still using CocoaPods
• standardize Xcode versioning strategy across all workflows (See comment)
• reduce the amount of custom Xcode configuration (ideally it will only be done in a few files)

For follow-up work, there are a couple products's workflows that still need to be migrated.

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[ncooke3]

Complete pass.

[ncooke3]

Fixed --test-spec arg input