[Infra] Install visionOS sims to workflows that couldn't find it

[ncooke3]

I only added this fix to the workflows that failed in the nightly testing report. It's possible we may want to extend it to all workflows until GitHub's runners consistently have the sims we need.

Fix #14542

[gemini-code-assist]

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Summary of Changes

This pull request addresses an issue where visionOS simulators were not consistently found in GitHub's runners, causing failures in nightly testing. To resolve this, I've added a step to explicitly install the visionOS platform using xcodebuild -downloadPlatform visionOS in several workflow files. This ensures that the necessary simulators are available before the tests are executed. The fix is applied conditionally based on the matrix.target value, specifically targeting 'visionOS' or 'visionOS spm'.

Highlights

• Bug Fix: Addresses the issue of missing visionOS simulators in GitHub runners, preventing test failures.
• Infrastructure: Adds a step to install visionOS simulators in workflows that target visionOS.
• Conditional Execution: The installation step is only executed when the workflow matrix target is set to 'visionOS' or 'visionOS spm'.

Changelog

Click here to see the changelog

• .github/workflows/abtesting.yml
  • Added a step to install visionOS if the target is visionOS (lines 123-125).
• .github/workflows/auth.yml
  • Added a step to install visionOS if the target is visionOS spm (lines 144-146).
• .github/workflows/core.yml
  • Added a step to install visionOS if the target is visionOS (lines 104-106).
• .github/workflows/crashlytics.yml
  • Added a step to install visionOS if the target is visionOS (lines 119-121).
• .github/workflows/mlmodeldownloader.yml
  • Added a step to install visionOS if the target is visionOS (lines 134-136).
• .github/workflows/remoteconfig.yml
  • Added a step to install visionOS if the target is visionOS (lines 158-160).
• .github/workflows/sessions.yml
  • Added a step to install visionOS if the target is visionOS (lines 114-116).
• .github/workflows/vertexai.yml
  • Added a step to install visionOS if the target is visionOS (lines 84-86).

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[gemini-code-assist]

Code Review

This pull request adds a step to install the visionOS simulator in several workflows. This is a good fix to ensure that the tests can run on the visionOS platform. The change is straightforward and addresses the reported issue.

Merge Readiness

The changes in this pull request are straightforward and address the reported issue. I have no concerns about merging this pull request. I am unable to directly approve the pull request, and users should have others review and approve this code before merging.