[apple] Consider adding an option for installing iOS/tvOS simulators when missing simulators cause test failures

## Description

It can happen that a test is marked as failed when an iOS/tvOS simulator is not found on the system.
Usually, this requires opening a ticket with dnceng/ddfun so that simulators become available on the host machines.
An alternative approach would be to introduce a new retry mechanism:
1. If a test fails due to a missing simulator
2. Install desired simulator via for example:
```
apple simulators install ios-simulator-64_18.0 --verbosity=Debug --xcode /Applications/Xcode_16_beta_6.app
```
3. Retry the test
which we could run when we experience said infra issues.

No source files or tests are named. Start by reviewing how missing iOS/tvOS simulators currently cause test failures, then examine the proposed `apple simulators install ios-simulator-64_18.0 --verbosity=Debug --xcode /Applications/Xcode_16_beta_6.app` command. Done means the relevant failure can trigger simulator installation and the test is retried afterward.

Written by the indexing model from the issue text.