Remove safe HTML from diff rows

The diffs get sanitized on the backend before we
recieve any data so this removes that directive
to help increase rendering performance.

Also removed some data getting set on the state when it shouldn't be.

app/assets/javascripts/diffs/components/diff_row.vue

 <script>
-import { GlTooltipDirective, GlSafeHtmlDirective as SafeHtml } from '@gitlab/ui';
+/* eslint-disable vue/no-v-html */
+import { GlTooltipDirective } from '@gitlab/ui';
 import { mapActions, mapGetters, mapState } from 'vuex';
 import { BV_HIDE_TOOLTIP } from '~/lib/utils/constants';
 import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
@@ -21,7 +22,6 @@ export default {
   },
   directives: {
     GlTooltip: GlTooltipDirective,
-    SafeHtml,
   },
   mixins: [glFeatureFlagsMixin()],
   props: {
@@ -256,7 +256,7 @@ export default {
           @mousedown="handleParallelLineMouseDown"
         >
           <strong v-if="isLeftConflictMarker">{{ conflictText(line.left) }}</strong>
-          <span v-else v-safe-html="line.left.rich_text"></span>
+          <span v-else v-html="line.left.rich_text"></span>
         </div>
       </template>
       <template v-else-if="!inline || (line.left && line.left.type === $options.CONFLICT_MARKER)">
@@ -345,7 +345,6 @@ export default {
         <div
           :id="line.right.line_code"
           :key="line.right.rich_text"
-          v-safe-html="line.right.rich_text"
           :class="[
             line.right.type,
             {
@@ -360,7 +359,7 @@ export default {
           <strong v-if="line.right.type === $options.CONFLICT_MARKER_THEIR">{{
             conflictText(line.right)
           }}</strong>
-          <span v-else v-safe-html="line.right.rich_text"></span>
+          <span v-else v-html="line.right.rich_text"></span>
         </div>
       </template>
       <template v-else>

app/assets/javascripts/diffs/store/mutations.js

@@ -77,15 +77,10 @@ export default {
   },
 
   [types.SET_DIFF_DATA_BATCH](state, data) {
-    const files = prepareDiffData({
+    state.diffFiles = prepareDiffData({
       diff: data,
       priorFiles: state.diffFiles,
     });
-
-    Object.assign(state, {
-      ...convertObjectPropsToCamelCase(data),
-    });
-    updateDiffFilesInState(state, files);
   },
 
   [types.SET_COVERAGE_DATA](state, coverageFiles) {