Allow skipping audit repository checks.

[reitermarkus]

• [x] Have you followed the guidelines in our Contributing document?
• [x] Have you checked to ensure there aren't other open Pull Requests for the same change?
• [x] Have you added an explanation of what your changes do and why you'd like us to include them?
• [ ] Have you written new tests for your changes? Here's an example.
• [x] Have you successfully run brew style with your changes locally?
• [x] Have you successfully run brew typecheck with your changes locally?
• [x] Have you successfully run brew tests with your changes locally?

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Needed for https://github.com/Homebrew/homebrew-cask/pull/130513, which in turn is needed for https://github.com/Homebrew/homebrew-cask/pull/130308.

[BrewTestBot]

Review period will end on 2022-08-30 at 00:00:00 UTC.

[Rylan12]

I think this overlaps with what @SMillerDev is doing in https://github.com/Homebrew/brew/pull/13746. That PR will allow --except repository to be passed to brew audit which gives more complete flexibility on this front.

[BrewTestBot]

Review period ended.

[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.