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Adding exclusion paths to the Mac builder_cache target to avoid archiving symlinks in the SDKs or other unwanted packages. Symlinks cause issues with the CAS archiving functionality. We have opened a bug for the LUCI team regarding this as well. Companion CL in recipes is here: https://flutter-review.googlesource.com/c/recipes/+/54110 *List which issues are fixed by this PR. You must list at least one issue.* Fixes https://github.com/flutter/flutter/issues/141688 *If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].* [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style