Fix wrong user on merge train restart

What does this MR do and why?

Fixes Restarting failed merged train shows wrong user (#481889 - closed).

This MR ensures merge train GraphQL query is always fetched from network and not cached. A cached query led to the wrong user displayed in the query.

How to set up and validate locally

1. Apply the patch

Preview.patch

Subject: [PATCH] Trigger merge train
---
Index: app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_auto_merge_enabled.vue
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_auto_merge_enabled.vue b/app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_auto_merge_enabled.vue
--- a/app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_auto_merge_enabled.vue	(revision 051e68f6ee320cf1ab4fa049c4d76c673995ebe9)
+++ b/app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_auto_merge_enabled.vue	(date 1729179130809)
@@ -16,11 +16,17 @@
   name: 'MRWidgetAutoMergeEnabled',
   apollo: {
     state: {
+      notifyOnNetworkStatusChange: true,
       query: autoMergeEnabledQuery,
       fetchPolicy: fetchPolicies.NETWORK_ONLY,
       variables() {
         return this.mergeRequestQueryVariables;
       },
+      result(response) {
+        if (response?.loading) {
+          console.log('fetching updated merge train state');
+        }
+      },
       update: (data) => data.project,
     },
   },
Index: app/assets/javascripts/vue_merge_request_widget/mr_widget_options.vue
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/app/assets/javascripts/vue_merge_request_widget/mr_widget_options.vue b/app/assets/javascripts/vue_merge_request_widget/mr_widget_options.vue
--- a/app/assets/javascripts/vue_merge_request_widget/mr_widget_options.vue	(revision 051e68f6ee320cf1ab4fa049c4d76c673995ebe9)
+++ b/app/assets/javascripts/vue_merge_request_widget/mr_widget_options.vue	(date 1729120280697)
@@ -47,6 +47,8 @@
 import MrWidgetReadyToMerge from './components/states/new_ready_to_merge.vue';
 import MergeChecks from './components/merge_checks.vue';
 
+let triggered = false;
+
 export default {
   // False positive i18n lint: https://gitlab.com/gitlab-org/frontend/eslint-plugin-i18n/issues/25
   // eslint-disable-next-line @gitlab/require-i18n-strings
@@ -94,6 +96,16 @@
         return this.pollInterval;
       },
       result(response) {
+        this.autoMergeSet = true;
+        this.$nextTick(() => {
+          if (!triggered) {
+            setTimeout(() => {
+              this.autoMergeSet = false;
+            }, 5000);
+            triggered = true;
+          }
+        });
+
         // 7 is the value for when the network status is ready
         if (response.networkStatus !== 7) return;
 
@@ -157,6 +169,7 @@
       issuableId: false,
       startingPollInterval: STATE_QUERY_POLLING_INTERVAL_DEFAULT,
       pollInterval: STATE_QUERY_POLLING_INTERVAL_DEFAULT,
+      autoMergeSet: false,
     };
   },
   computed: {
@@ -234,6 +247,7 @@
       return this.hasMergeError || this.showMergePipelineForkWarning;
     },
     mergeBlockedComponentVisible() {
+      if (this.autoMergeSet) return true;
       return !(
         [
           'checking',
@@ -249,6 +263,7 @@
       );
     },
     autoMergeEnabled() {
+      if (this.autoMergeSet) return true;
       return this.mr.autoMergeEnabled;
     },
   },

2. Open browser console
3. Go to any merge request that has pipelines
4. Observe that fetching updated merge train state is logged twice