Replace calls to writeQuery for client mutations in PA

Instead of writing directly to cache with writeQuery call to
apollo, we use a local mutation and resolver. There
are no user facing changes.

app/assets/javascripts/pipeline_editor/components/commit/commit_section.vue

@@ -10,8 +10,8 @@ import {
 import commitCIFile from '../../graphql/mutations/commit_ci_file.mutation.graphql';
 import updateCurrentBranchMutation from '../../graphql/mutations/update_current_branch.mutation.graphql';
 import updateLastCommitBranchMutation from '../../graphql/mutations/update_last_commit_branch.mutation.graphql';
+import updatePipelineEtag from '../../graphql/mutations/update_pipeline_etag.mutation.graphql';
 import getCurrentBranch from '../../graphql/queries/client/current_branch.graphql';
-import getPipelineEtag from '../../graphql/queries/client/pipeline_etag.graphql';
 
 import CommitForm from './commit_form.vue';
 
@@ -96,10 +96,10 @@ export default {
             content: this.ciFileContent,
             lastCommitId: this.commitSha,
           },
-          update(store, { data }) {
+          update(_, { data }) {
             const pipelineEtag = data?.commitCreate?.commit?.commitPipelinePath;
             if (pipelineEtag) {
-              store.writeQuery({ query: getPipelineEtag, data: { pipelineEtag } });
+              this.$apollo.mutate({ mutation: updatePipelineEtag, variables: pipelineEtag });
             }
           },
         });

app/assets/javascripts/pipeline_editor/graphql/mutations/update_pipeline_etag.mutation.graphql

+mutation updatePipelineEtag($pipelineEtag: String) {
+  updatePipelineEtag(pipelineEtag: $pipelineEtag) @client
+}

app/assets/javascripts/pipeline_editor/graphql/resolvers.js

@@ -2,6 +2,7 @@ import axios from '~/lib/utils/axios_utils';
 import getAppStatus from './queries/client/app_status.graphql';
 import getCurrentBranchQuery from './queries/client/current_branch.graphql';
 import getLastCommitBranchQuery from './queries/client/last_commit_branch.query.graphql';
+import getPipelineEtag from './queries/client/pipeline_etag.graphql';
 
 export const resolvers = {
   Mutation: {
@@ -49,5 +50,11 @@ export const resolvers = {
         data: { lastCommitBranch },
       });
     },
+    updatePipelineEtag: (_, { pipelineEtag }, { cache }) => {
+      cache.writeQuery({
+        query: getPipelineEtag,
+        data: { pipelineEtag },
+      });
+    },
   },
 };