Allow non-admin users to delete review requests (#29057)

Fix #14459

The following users can add/remove review requests of a PR
- the poster of the PR
- the owner or collaborators of the repository
- members with read permission on the pull requests unit

models/fixtures/team_user.yml

@@ -129,3 +129,21 @@
   org_id: 17
   team_id: 9
   uid: 15
+
+-
+  id: 23
+  org_id: 41
+  team_id: 21
+  uid: 40
+
+-
+  id: 24
+  org_id: 41
+  team_id: 22
+  uid: 38
+
+-
+  id: 25
+  org_id: 41
+  team_id: 22
+  uid: 39