Basically, implements a multi-entity search functionality with filters
for projects, jobsets, evaluations and builds. Also fixes COUNT query to
apply same filters as main query, and fixes an offset mismatch in
response. Some integration tests have also been added, but chances are
we'll want to write VM tests for this.
Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Icdda77966a7218f54fd34b78bdc9b55c6a6a6964
