fix: Add recentupdated as recognized sort option

- Add `recentupdated` to the `OrderByMap`.
- Add integration testing for organization and user repository sorting.
- Resolves #5612
- Regression from 12e23ee199 where the
`recentupdated` case was not added to the map, but was handled
seperately as a fallback. The regression came into affect when
5a0bc35799 also relied on this map but
didn't handle the `recentupdated` case.

(cherry picked from commit df38c41c7a)

tests/integration/org_test.go

@@ -28,6 +28,7 @@ func TestOrgRepos(t *testing.T) {
 		users = []string{"user1", "user2"}
 		cases = map[string][]string{
 			"alphabetically":        {"repo21", "repo3", "repo5"},
+			"recentupdate":          {"repo21", "repo5", "repo3"},
 			"reversealphabetically": {"repo5", "repo3", "repo21"},
 		}
 	)