Fix `/tag/aa%20bb` project URIs
Summary:
Ref T9551. To set things up:
- Name a project `aa bb`. This will have the tag `aa_bb`.
- Try to visit `/tag/aa%20bb`.
Here's what happens now:
- You get an Aphront redirect error as it tries to add the trailing `/`. Add `phutil_escape_uri()` so that works again.
- Then, you 404, even though this tag is reasonably equivalent to the real project tag and could be redirected. Add a fallback to lookup, resolve, and redirect if we can find a hit for the tag.
This also fixes stuff like `/tag/AA_BB/`.
Test Plan: Visited URIs like `/tag/aa%20bb`, `/tag/aa%20bb/`, `/tag/Aa_bB/`, etc. None of them worked before and now they all do.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T9551
Differential Revision: https://secure.phabricator.com/D14260