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

tests/integration/api_nodeinfo_test.go

@@ -32,8 +32,8 @@ func TestNodeinfo(t *testing.T) {
 		DecodeJSON(t, resp, &nodeinfo)
 		assert.True(t, nodeinfo.OpenRegistrations)
 		assert.Equal(t, "gitea", nodeinfo.Software.Name)
-		assert.Equal(t, 26, nodeinfo.Usage.Users.Total)
-		assert.Equal(t, 20, nodeinfo.Usage.LocalPosts)
+		assert.Equal(t, 29, nodeinfo.Usage.Users.Total)
+		assert.Equal(t, 22, nodeinfo.Usage.LocalPosts)
 		assert.Equal(t, 3, nodeinfo.Usage.LocalComments)
 	})
 }