Sort project select dropdown by similarity

This falls back to ID sorting when the feature flag is disabled

app/assets/javascripts/boards/components/project_select.vue

@@ -64,10 +64,10 @@ export default {
           this.groupId,
           term,
           {
-            search_namespaces: true,
             with_issues_enabled: true,
             with_shared: false,
             include_subgroups: true,
+            order_by: 'similarity',
             ...additionalAttrs,
           },
           projects => {

app/assets/javascripts/project_select.js

@@ -54,11 +54,11 @@ const projectSelect = () => {
             this.groupId,
             query.term,
             {
-              search_namespaces: true,
               with_issues_enabled: this.withIssuesEnabled,
               with_merge_requests_enabled: this.withMergeRequestsEnabled,
               with_shared: this.withShared,
               include_subgroups: this.includeProjectsInSubgroups,
+              order_by: 'similarity',
             },
             projectsCallback,
           );

spec/features/groups/issues_spec.rb

@@ -110,8 +110,6 @@ RSpec.describe 'Group issues page' do
         find('.empty-state .js-lazy-loaded')
         find('.new-project-item-link').click
 
-        find('.select2-input').set(group.name)
-
         page.within('.select2-results') do
           expect(page).to have_content(project.full_name)
           expect(page).not_to have_content(project_with_issues_disabled.full_name)