Fix lost reports when switching workflow versions

We serialize workflow.reports, but we were only setting it on the
workflow instance if the markdown editor emits it.

Fixes a part of https://github.com/galaxyproject/galaxy/issues/17903

client/src/components/Workflow/Editor/Index.vue

@@ -145,7 +145,7 @@
     <MarkdownEditor
         v-else
         :markdown-text="markdownText"
-        :markdown-config="markdownConfig"
+        :markdown-config="report"
         mode="report"
         :title="'Workflow Report: ' + name"
         :steps="steps"
@@ -310,7 +310,6 @@ export default {
     data() {
         return {
             isCanvas: true,
-            markdownConfig: null,
             markdownText: null,
             versions: [],
             parameters: null,
@@ -762,8 +761,8 @@ export default {
 
             const report = data.report || {};
             const markdown = report.markdown || reportDefault;
+            this.report = report;
             this.markdownText = markdown;
-            this.markdownConfig = report;
             this.hideModal();
             this.stateMessages = getStateUpgradeMessages(data);
             const has_changes = this.stateMessages.length > 0;