Suppress note messages (but not warnings or errors) in --quiet mode

[dfabulich]

This matches the semantics of xcodebuild -quiet, which I quite like: warnings and errors are logged, info/remark/note suppressed.

(The only way for xcodebuild to pass --quiet is via skiptools/skip#655)

If necessary, we could add a --silent mode, but I don't think we'll want/need it.

Skip Pull Request Checklist:

• REQUIRED: I have signed the Contributor Agreement
• REQUIRED: I have tested my change locally with swift test
• OPTIONAL: I have tested my change on an iOS simulator or device
• OPTIONAL: I have tested my change on an Android emulator or device

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