remove search_id for label dropdown filter

CHANGELOG

@@ -6,6 +6,7 @@ v 8.11.0 (unreleased)
   - Retrieve rendered HTML from cache in one request
   - Load project invited groups and members eagerly in ProjectTeam#fetch_members
   - Add GitLab Workhorse version to admin dashboard (Katarzyna Kobierska Ula Budziszewska)
+  - Remove `search_id` of labels dropdown filter to fix 'Missleading URI for labels in Merge Requests and Issues view' !5368 (Scott Le)
 
 v 8.10.1 (unreleased)
  - Fix bug where replies to commit notes displayed in the MR discussion tab wouldn't show up on the commit page

app/views/shared/issuable/_label_page_default.html.haml

@@ -4,7 +4,7 @@
 - filter_placeholder = local_assigns.fetch(:filter_placeholder, 'Search labels')
 .dropdown-page-one
   = dropdown_title(title)
-  = dropdown_filter(filter_placeholder, search_id: "label-name")
+  = dropdown_filter(filter_placeholder)
   = dropdown_content
   - if @project && show_footer
     = dropdown_footer do

spec/features/issues/filter_by_labels_spec.rb

@@ -205,7 +205,7 @@ feature 'Issue filtering by Labels', feature: true do
       page.within '.labels-filter' do
         click_button 'Label'
         wait_for_ajax
-        fill_in 'label-name', with: 'bug'
+        find('.dropdown-input input').set 'bug'
 
         page.within '.dropdown-content' do
           expect(page).not_to have_content 'enhancement'