collab: Extract tests into integration tests crate (#47668)

Reduces time needed to build collab tests from 48s to 38s.

Release Notes:

- N/A
b74b1977d4Piotr Osiewicz committed on 1/26/2026, 7:28:09 PM· committed by GitHubparent9326d61
54 files changedLine totals unavailable