Improve patrol setup instruction

[piotruela]

Use case

When setting up a patrol in an iOS project, user often encounter recurring issues. Especially in the case of an application that has flavors.

Proposal

It would be helpful to include information in the instructions on how to resolve them.

• The emulator cloning itself when running patrol tests (i.e. here) -> Solution is to disable parallel execution for all schemes (if project has multiple),
• The app launches, but the tests are not being executed (i.e. here) -> Solution is to remove FLUTTER_TARGET from all Build Configurations for Runner,
• Error while performing the tests using XCode 15:

  error: Sandbox: dart(43386) deny(1) file-read-data /Users/user/project/example_project/build/ios_integ/Build/Products/Debug-tst-iphonesimulator/Flutter.framework/Flutter (in target 'RunnerUITests' from project 'Runner')
  

  -> Solution is to disable User Script Sandboxing for RunnerUITests in Build Settings

[github-actions]

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