Allow multi-platform visionOS IPAs to be created

[DavidBrunow]

🔑

Checklist

• I've run bundle exec rspec from the root directory to see all new and existing tests pass
• I've followed the fastlane code style and run bundle exec rubocop -a to ensure the code style is valid
• I see several green ci/circleci builds in the "All checks have passed" section of my PR (connect CircleCI to GitHub if not)
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.
• I've added or updated relevant unit tests.

Motivation and Context

Creating an IPA for visionOS with a multi-platform target fails.

Description

This change allows an IPA to be built by treating a multi-platform target building for the visionOS SDK to be treated like an iOS target for the purposes of creating an IPA. I tested this on a closed source project.

Testing Steps

Testing would require having a multi-platform app target. Then, run the gym command with the following settings:

gym(
  archive_path: "Release.xcarchive",
  build_path: ".",
  clean: true,
  configuration: "Release",
  export_options: RELEVANT_EXPORT_OPTIONS_FOR_PROJECT,
  output_name: "Release.ipa",
  scheme: "SCHEME_NAME",
  sdk: "xros",
  workspace: "WORKSPACE",
)

If you run that command from trunk you will see that the IPA is not created. If you run it from this branch you will see that it is created.