Add ai agent skill for iOS instrumented tests

[ASalavei]

Add claude skill explaining how to run iOS Instrumented Tests

Release Notes

N/A

[igordmn]

This duplicates and extends the "Run iOS instrumented tests" in MULTIPLATFORM.md, and seems useful for humans too?

Can we just move all this there, and point agents to the readme?

[ASalavei]

Do you mean, to use MULTIPLATFORM.md instead of skills - not sure it's a good idea. At least it goes against the documentation. Skills have very specific format and dedication. If you want the agent to do tasks efficiently, you should follow this guidelines.
Obviously, we can tell the LLM to read MULTIPLATFORM.md before doing any job, but it won't be the same.
I would say, vice versa it does not work either because skills will have things like This skill should be used when the user asks about "running iOS tests", "iOS instrumented tests", "how to run ios tests", "launch specific ios test" and these tests are located in the "compose/ui/ui/src/uikitInstrumentedTest" directory. which does not look good for human-readable manual

[igordmn]

What I am worried about:

• we described useful information for humans that we didn't describe in MULTIPLATFORM.md:
  • that I need to change "compose/ui/ui/src/uikitInstrumentedTest/kotlin/androidx/compose/ui/Configuration.kt" to run specific tests
  • we mentioned simulator id, do we need to specify it? we didn't mention it in MULTIPLATFORM.md
  • the purpose of testutils-xctest
  • where the uikitInstrumentedTest environment is located (compose/ui/ui/src/uikitInstrumentedTest/kotlin/androidx/compose/ui/test)
• we duplicated information and we have to keep 2 places up-to-date

Maybe we can solve it this way:

• move all human-useful info to MULTIPLATFORM.md, testutils-xctest/README.md, ui/ui/src/uikitInstrumentedTest/README.md
• keep robot-specific info here and reference human-related-docs
• remove some info that isn't useful for humans and robots can easily know this.
• avoid specific names/paths to not miss them during refactorings ("the setup function" instead of "setupXCTestSuite", "the xc test configuration Kotlin file" instead of the specific file)

Though, if you think it could degrade performance of the agent, we can accept the new duty of keeping this up-to-date.

[igordmn]

If you have doubts, another opinion, or it is more difficult to implement, I am fine just with the current skill