PR #110444 - ui: all xhr paths from db console are now relative

[cockroach-teamcity]

Exalate commented:

Related PR: cockroachdb/cockroach#110444
Commit: cockroachdb/cockroach@3d81112
Epic: CRDB-21265
Fixes: CRDB-4219 CRDB-21257

---

Release note (ops change, ui change): The DB Console now constructs
client-side requests using relative URLs instead of absolute ones.
This enables proxying of the DB Console at arbitrary subpaths.

Jira Issue: DOC-8794