Rename testing overhead tables to be more descriptive (#4101)

copilot:summary

Author: PaliC

torchci/pages/testing_overhead.tsx

@@ -62,7 +62,7 @@ export default function TestingOverhead() {
     return (
       <Grid item xs={12} height={ROW_HEIGHT}>
         <TablePanel
-          title={`Unsharded Testing times for Workflow: ${workflowName} on ${startTime.format(
+          title={`Total Testing Times per Workflow on All Runners: ${workflowName} on ${startTime.format(
             "YYYY-MM-DD"
           )}`}
           queryCollection={"commons"}

torchci/pages/testing_overhead/oncall_insights.tsx

@@ -47,7 +47,7 @@ function GenerateTestInsightsOverviewTable({
   return (
     <Grid item xs={12} height={ROW_HEIGHT}>
       <TablePanel
-        title={`Unsharded Testing times for Workflow: ${workflowName} on ${startTime.format(
+        title={`Total Testing Times per Workflow on all Runners: ${workflowName} on ${startTime.format(
           "YYYY-MM-DD"
         )}`}
         queryCollection={"commons"}