Remove flag filter_pipelines_search

Removes the feature flag
filter_pipelines_search the feature
has been stable for 6 months.

app/assets/javascripts/pipelines/components/pipelines_list/pipelines.vue

@@ -13,7 +13,6 @@ import CIPaginationMixin from '~/vue_shared/mixins/ci_pagination_api_mixin';
 import PipelinesFilteredSearch from './pipelines_filtered_search.vue';
 import { validateParams } from '../../utils';
 import { ANY_TRIGGER_AUTHOR, RAW_TEXT_WARNING, FILTER_TAG_IDENTIFIER } from '../../constants';
-import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 
 export default {
   components: {
@@ -23,7 +22,7 @@ export default {
     PipelinesFilteredSearch,
     GlIcon,
   },
-  mixins: [pipelinesMixin, CIPaginationMixin, glFeatureFlagsMixin()],
+  mixins: [pipelinesMixin, CIPaginationMixin],
   props: {
     store: {
       type: Object,
@@ -209,9 +208,6 @@ export default {
         },
       ];
     },
-    canFilterPipelines() {
-      return this.glFeatures.filterPipelinesSearch;
-    },
     validatedParams() {
       return validateParams(this.params);
     },
@@ -306,7 +302,6 @@ export default {
     </div>
 
     <pipelines-filtered-search
-      v-if="canFilterPipelines"
       :project-id="projectId"
       :params="validatedParams"
       @filterPipelines="filterPipelines"

app/controllers/projects/pipelines_controller.rb

@@ -12,7 +12,6 @@ class Projects::PipelinesController < Projects::ApplicationController
   before_action :authorize_create_pipeline!, only: [:new, :create, :config_variables]
   before_action :authorize_update_pipeline!, only: [:retry, :cancel]
   before_action do
-    push_frontend_feature_flag(:filter_pipelines_search, project, default_enabled: true)
     push_frontend_feature_flag(:dag_pipeline_tab, project, default_enabled: true)
     push_frontend_feature_flag(:pipelines_security_report_summary, project)
     push_frontend_feature_flag(:new_pipeline_form, project)

config/feature_flags/development/filter_pipelines_search.yml

----
-name: filter_pipelines_search
-introduced_by_url: 
-rollout_issue_url: 
-group: 
-type: development
-default_enabled: true

spec/frontend/pipelines/pipelines_spec.js

@@ -74,7 +74,6 @@ describe('Pipelines', () => {
 
   const createComponent = (props = defaultProps, methods) => {
     wrapper = mount(PipelinesComponent, {
-      provide: { glFeatures: { filterPipelinesSearch: true } },
       propsData: {
         store: new Store(),
         projectId: '21',