Signed-off-by: Rémy Coutable <remy@rymai.me>

See https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3566

Change fix, instead of hacking in a filter clear every time, fix the root cause by only selecting elements for that dropdown instance

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/38315
Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/38187

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/37023

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/34261

added specs to sticky util file
added `No files found.` text when results are empty

This was caused by the blur & then the focus after transition end

Closes #35515

Closes #33216

Closes #31997

Previously it was added when you started typing. But there is actually a delay before sending any requests which meant the loading icon was visible but it wasn't actually loading anything