task(auth): Normalize email bounce lookup

[dschom]

Because

• We can make bounce look up better.

This pull request

• Adds ability to tree handle aliases on bounced emails.

Issue that this pull request solves

Closes: FXA-12827

Checklist

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• My commit is GPG signed.
• If applicable, I have modified or added tests which pass locally.
• I have added necessary documentation (if appropriate).
• I have verified that my changes render correctly in RTL (if appropriate).

Screenshots (Optional)

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Other information (Optional)

This was patched on train-325. This PR just incorporates the change back into main and resolves some merge conflicts.