Refresh iOS 16 and 17 e2e test strategy

[twometresteve]

Goal

Refresh the iOS 16/17 e2e test strategy to:

• Run full set of e2e tests on iOS 17 for every Git push
• Run subset of tests on all other iOS versions for each push
• Always run app hang tests separately

Changeset

• Full set of iOS 16 tests moved to the full pipeline
• Barebones tests for iOS 16 added to the basic pipeline
• App hang tests for iOS 17 factored into their own buildkite job

Due to the nature of the code diff, this PR would be best reviewed by inspecting the build results or each pipeline file as a whole.

Testing

Covered by a full CI run.

[github-actions]

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