[No QA] ci: don't fail iOS build when IPA is missing on Rock cache hits

[roryabraham]

Explanation of Change

PR #83350 added a set-ipa-filename step to buildIOS.yml that hard-fails when no .ipa is found locally for non-Adhoc builds. However, Rock remote-cache hits don't materialize the IPA locally — they confirm the build succeeded without re-building. This causes verifyHybridApp.yml (which calls buildIOS.yml with variant: Release) to fail on cache hits, breaking CI for unrelated PRs like #83256.

The fix changes the step to always warn (never fail) when the IPA is missing. Deploy safety is preserved because deploy.yml independently validates the IPA path before uploading to TestFlight.

Fixed Issues

Fixes CI regression introduced in #83350.

Tests

• Verify that verifyHybridApp CI passes.

Offline tests

None

QA Steps

None.

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
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  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
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Screenshots/Videos

N/A

[melvin-bot]

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