infra: Migrate away from ObjC quickstarts

[ncooke3]

Corresponds to quickstart-ios/pull/1806

Follow-up work

• Testing team onboarding
• Re-usable workflows for zip
• Cleanup Swift suffixes (including infra)
• Migrate away from Ruby Xcodeproj (make an issue)
• Look into applying [Firebase AI] Switch to Xcode 16 project format quickstart-ios#1808 to all product QSs

Fixes #8057

#no-changelog

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[ncooke3]

/gemini review

[gemini-code-assist]

Code Review

This pull request is a significant infrastructure update to migrate away from Objective-C quickstarts. It introduces several new scripts (patch_crashlytics_run_path.rb, remove_spm_dependencies.rb, setup_quickstart_spm.sh) to handle Xcode project modifications and SPM setup in a more automated and robust way. Existing scripts are also improved with better error handling, robustness, and simplification. The changes are well-structured and greatly improve the CI process for testing quickstarts. I have a couple of minor suggestions to further improve the new scripts' reusability and consistency.