ui: allow stmts page to search across explain plan page

Partially addresses #71615.

Previously, the search functionality for the stmts page only allowed a search
through the statement query. This change adds the statement's Plan as part of
that search.

Release note (ui change): logical plan text included in searchable text for
stmts page.

pkg/ui/workspaces/cluster-ui/src/statementDetails/planView/planView.tsx

@@ -58,7 +58,6 @@ function warnForAttribute(attr: IAttr): boolean {
 
 // planNodeAttrsToString converts an array of FlatPlanNodeAttribute[] into a string.
 export function planNodeAttrsToString(attrs: FlatPlanNodeAttribute[]): string {
-  attrs.map(attr => `${attr.key} ${attr.values.join(" ")}`).join(" ");
   return attrs.map(attr => `${attr.key} ${attr.values.join(" ")}`).join(" ");
 }
 
@@ -67,10 +66,9 @@ export function planNodeToString(plan: FlatPlanNode): string {
   const str = `${plan.name} ${planNodeAttrsToString(plan.attrs)}`;
 
   if (plan.children.length > 0) {
-    const str2 = plan.children
+    return plan.children
       .map(child => `${str} ${planNodeToString(child)}`)
       .join(" ");
-    return str2;
   }
   return str;
 }