R1:576b73dc5375

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…