Index all repository URIs, not just the "primary" repository URI

Summary:
Ref T10923. When regenerating the URI index for a repository, index every URI.

• Also, make the index slightly stricter (domain + path instead of just path). Excluding the domain made more sense when we were generating only first-party URIs.
• Make the index smarter about /diffusion/123/ URIs.
• Show normalized URIs in diffusion.repository.search results.

Test Plan:

• Ran migration.
• Verified sensible-looking results in database.
• Searched for a repository URI by first-party clone URI.
• Searched for a repository URI by mirror URI.
• Used diffusion.repository.search to get information about repository URIs.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10923

Differential Revision: https://secure.phabricator.com/D15876