feat: show more relevant results for 'dependencies' dropdown (#8003)

- Fix issue dropdown breaking when currently selected issue is included in results.
- Add `sort` parameter to `/issues/search` API.
- Sort dropdown by relevance.
- Make priority_repo_id work again.
- Added E2E test.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8003
Reviewed-by: Shiny Nematoda <snematoda@noreply.codeberg.org>
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Danko Aleksejevs <danko@very.lv>
Co-committed-by: Danko Aleksejevs <danko@very.lv>

tests/e2e/utils_e2e_test.go

@@ -93,6 +93,7 @@ func createSessions(t testing.TB) {
 	users := []string{
 		"user1",
 		"user2",
+		"user11",
 		"user12",
 		"user18",
 		"user29",