Remove feature flag for pipeline editor drawer

The pipeline editor drawer is a section that
helps new user get started. It has been multiple
months since this feature has been enabled by default
for .com and self hosted without any incident.
This commit removes that flag pipeline_editor_drawer.

Changelog: other

app/assets/javascripts/pipeline_editor/pipeline_editor_home.vue

 <script>
-import glFeatureFlagMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import CommitSection from './components/commit/commit_section.vue';
 import PipelineEditorDrawer from './components/drawer/pipeline_editor_drawer.vue';
 import PipelineEditorFileNav from './components/file_nav/pipeline_editor_file_nav.vue';
@@ -15,7 +14,6 @@ export default {
     PipelineEditorHeader,
     PipelineEditorTabs,
   },
-  mixins: [glFeatureFlagMixin()],
   props: {
     ciConfigData: {
       type: Object,
@@ -44,9 +42,6 @@ export default {
     showCommitForm() {
       return TABS_WITH_COMMIT_FORM.includes(this.currentTab);
     },
-    showPipelineDrawer() {
-      return this.glFeatures.pipelineEditorDrawer;
-    },
   },
   methods: {
     setCurrentTab(tabName) {
@@ -77,6 +72,6 @@ export default {
       :commit-sha="commitSha"
       v-on="$listeners"
     />
-    <pipeline-editor-drawer v-if="showPipelineDrawer" />
+    <pipeline-editor-drawer />
   </div>
 </template>

app/controllers/projects/ci/pipeline_editor_controller.rb

@@ -3,7 +3,6 @@
 class Projects::Ci::PipelineEditorController < Projects::ApplicationController
   before_action :check_can_collaborate!
   before_action do
-    push_frontend_feature_flag(:pipeline_editor_drawer, @project, default_enabled: :yaml)
     push_frontend_feature_flag(:pipeline_editor_mini_graph, @project, default_enabled: :yaml)
     push_frontend_feature_flag(:schema_linting, @project, default_enabled: :yaml)
   end

config/feature_flags/development/pipeline_editor_drawer.yml

----
-name: pipeline_editor_drawer
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/60856
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/329806
-milestone: '13.12'
-type: development
-group: group::pipeline authoring
-default_enabled: true

spec/frontend/pipeline_editor/pipeline_editor_home_spec.js

@@ -25,7 +25,6 @@ describe('Pipeline editor home wrapper', () => {
       },
       provide: {
         glFeatures: {
-          pipelineEditorDrawer: true,
           ...glFeatures,
         },
       },
@@ -94,12 +93,4 @@ describe('Pipeline editor home wrapper', () => {
       expect(findCommitSection().exists()).toBe(true);
     });
   });
-
-  describe('Pipeline drawer', () => {
-    it('hides the drawer when the feature flag is off', () => {
-      createComponent({ glFeatures: { pipelineEditorDrawer: false } });
-
-      expect(findPipelineEditorDrawer().exists()).toBe(false);
-    });
-  });
 });