`AppIdentifierPrefix` substitution in Info.plist

Xcode does this by default, while Bazel doesn't since it doesn't have this info because `provisioning_profile` is optional when building for the simulator.

The issue names no file, test, or entry point. First locate the rules_apple handling for Info.plist and simulator builds, then compare the expected Xcode AppIdentifierPrefix behavior with builds where provisioning_profile is optional; done means the substitution is defined and covered for that case.

Written by the indexing model from the issue text.