Remove mr_widget_merge_help and refs

Since one logic branch depends on a prop that is never pased in,
this entire component is no longer needed.

Remove component.
Remove ref to component in parent.
Update specs accordingly.

app/assets/javascripts/vue_merge_request_widget/components/mr_widget_merge_help.vue

-<script>
-import { GlButton, GlModalDirective } from '@gitlab/ui';
-import { sprintf, s__ } from '~/locale';
-
-export default {
-  name: 'MRWidgetMergeHelp',
-  components: {
-    GlButton,
-  },
-  directives: {
-    GlModalDirective,
-  },
-  props: {
-    missingBranch: {
-      type: String,
-      required: false,
-      default: '',
-    },
-  },
-  computed: {
-    missingBranchInfo() {
-      return sprintf(
-        s__(
-          'mrWidget|If the %{branch} branch exists in your local repository, you can merge this merge request manually using the',
-        ),
-        { branch: this.missingBranch },
-      );
-    },
-  },
-};
-</script>
-<template>
-  <section class="gl-py-3 gl-pr-3 gl-pl-5 gl-ml-7 mr-widget-help gl-font-style-italic">
-    <template v-if="missingBranch">
-      {{ missingBranchInfo }}
-    </template>
-    <template v-else>
-      {{ s__('mrWidget|You can merge this merge request manually using the') }}
-    </template>
-
-    <gl-button
-      v-gl-modal-directive="'modal-merge-info'"
-      variant="link"
-      class="gl-mt-n2 js-open-modal-help"
-    >
-      {{ s__('mrWidget|command line') }}
-    </gl-button>
-  </section>
-</template>

app/assets/javascripts/vue_merge_request_widget/mr_widget_options.vue

@@ -18,7 +18,6 @@ import GroupedTestReportsApp from '../reports/components/grouped_test_reports_ap
 import Loading from './components/loading.vue';
 import MrWidgetAlertMessage from './components/mr_widget_alert_message.vue';
 import WidgetHeader from './components/mr_widget_header.vue';
-import WidgetMergeHelp from './components/mr_widget_merge_help.vue';
 import MrWidgetPipelineContainer from './components/mr_widget_pipeline_container.vue';
 import WidgetRelatedLinks from './components/mr_widget_related_links.vue';
 import WidgetSuggestPipeline from './components/mr_widget_suggest_pipeline.vue';
@@ -59,7 +58,6 @@ export default {
     // ExtensionsContainer,
     'mr-widget-header': WidgetHeader,
     'mr-widget-suggest-pipeline': WidgetSuggestPipeline,
-    'mr-widget-merge-help': WidgetMergeHelp,
     MrWidgetPipelineContainer,
     'mr-widget-related-links': WidgetRelatedLinks,
     MrWidgetAlertMessage,
@@ -140,9 +138,6 @@ export default {
     componentName() {
       return stateMaps.stateToComponentMap[this.mr.state];
     },
-    shouldRenderMergeHelp() {
-      return stateMaps.statesToShowHelpWidget.indexOf(this.mr.state) > -1;
-    },
     hasPipelineMustSucceedConflict() {
       return !this.mr.hasCI && this.mr.onlyAllowMergeIfPipelineSucceeds;
     },
@@ -530,9 +525,6 @@ export default {
           <source-branch-removal-status v-if="shouldRenderSourceBranchRemovalStatus" />
         </div>
       </div>
-      <div v-if="shouldRenderMergeHelp" class="mr-widget-footer">
-        <mr-widget-merge-help />
-      </div>
     </div>
     <mr-widget-pipeline-container
       v-if="shouldRenderMergedPipeline"

spec/frontend/vue_mr_widget/components/mr_widget_merge_help_spec.js

-import { shallowMount } from '@vue/test-utils';
-import MergeHelpComponent from '~/vue_merge_request_widget/components/mr_widget_merge_help.vue';
-
-describe('MRWidgetMergeHelp', () => {
-  let wrapper;
-
-  const createComponent = ({ props = {} } = {}) => {
-    wrapper = shallowMount(MergeHelpComponent, {
-      propsData: {
-        missingBranch: 'this-is-not-the-branch-you-are-looking-for',
-        ...props,
-      },
-    });
-  };
-
-  afterEach(() => {
-    wrapper.destroy();
-    wrapper = null;
-  });
-
-  describe('with missing branch', () => {
-    beforeEach(() => {
-      createComponent();
-    });
-
-    it('renders missing branch information', () => {
-      expect(wrapper.find('.mr-widget-help').text()).toContain(
-        'If the this-is-not-the-branch-you-are-looking-for branch exists in your local repository',
-      );
-    });
-  });
-
-  describe('without missing branch', () => {
-    beforeEach(() => {
-      createComponent({
-        props: { missingBranch: '' },
-      });
-    });
-
-    it('renders information about how to merge manually', () => {
-      expect(wrapper.find('.mr-widget-help').text()).toContain(
-        'You can merge this merge request manually',
-      );
-    });
-  });
-});

spec/frontend/vue_mr_widget/mr_widget_options_spec.js

@@ -91,18 +91,6 @@ describe('MrWidgetOptions', () => {
         });
       });
 
-      describe('shouldRenderMergeHelp', () => {
-        it('should return false for the initial merged state', () => {
-          expect(wrapper.vm.shouldRenderMergeHelp).toBeFalsy();
-        });
-
-        it('should return true for a state which requires help widget', () => {
-          wrapper.vm.mr.state = 'conflicts';
-
-          expect(wrapper.vm.shouldRenderMergeHelp).toBeTruthy();
-        });
-      });
-
       describe('shouldRenderPipelines', () => {
         it('should return true when hasCI is true', () => {
           wrapper.vm.mr.hasCI = true;