Fix github action for testing iOS

[pasin]

Remove Xcode 16.4 selection and simulator device lookup step

[github-actions]

This is a release branch and commits are restricted.

Please confirm this PR is one of the following:

• A response to a customer ask
• A change per our security policy
• A non-functional change (e.g. changes needed for building an older version)
• A bug fix for a x.y.0 release
• A change that has been granted an exception (please comment)

[Copilot]

Pull request overview

This PR updates the iOS GitHub Actions workflow to make CI builds less dependent on hardcoded Xcode and simulator device selection, relying instead on Xcode’s generic iOS Simulator destination for xcodebuild build-for-testing.

Changes:

• Removed the step that forced selection of a specific Xcode install (/Applications/Xcode_16.4.app).
• Removed the simulator device discovery/file handoff step (xctrace ... > device).
• Updated the xcodebuild build-for-testing invocation to use -destination "generic/platform=iOS Simulator".

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