Add autogenerated scheme pre/post action support

[brentleyjones]

Summary

• add native autogenerated-scheme pre/post action support for build, run, test, and profile
• add explicit run_build_post_actions_on_failure handling for build post-actions via the existing run API surface

Details

• extend xcschemes.autogeneration_config(...) to carry run/profile/test action config and split build vs launch actions from xcschemes.autogeneration.run(...)
• plumb autogenerated execution actions through the Starlark scheme writer, the autogeneration config param file, and the Swift xcschemes generator
• emit runPostActionsOnFailure="YES" on BuildAction only when configured
• expand tests across internal Starlark writers, automatic scheme generation, custom scheme parsing, and final XML emission

Testing

• bazel test //tools/generators/lib/XCScheme:XCSchemeTests //tools/generators/xcschemes:xcschemes_tests //test/internal/xcschemes:xcschemes
• bazel build //xcodeproj:xcodeproj //xcodeproj/internal:internal

[adincebic]

Nice.