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_unit.yml

@@ -286,3 +286,39 @@
   team_id: 2
   type: 8
   access_mode: 2
+
+-
+  id: 49
+  team_id: 21
+  type: 1
+  access_mode: 4
+
+-
+  id: 50
+  team_id: 21
+  type: 2
+  access_mode: 4
+
+-
+  id: 51
+  team_id: 21
+  type: 3
+  access_mode: 4
+
+-
+  id: 52
+  team_id: 22
+  type: 1
+  access_mode: 1
+
+-
+  id: 53
+  team_id: 22
+  type: 2
+  access_mode: 1
+
+-
+  id: 54
+  team_id: 22
+  type: 3
+  access_mode: 1