feat(replay): add tooltip to replay heading (#95462)

Clarify our sorting mechanism on the "replay" heading.

Co-authored-by: Michelle Zhang <56095982+michellewzhang@users.noreply.github.com>

Author: jas-kas

static/app/components/replays/table/replayTableColumns.tsx

@@ -420,7 +420,11 @@ export const ReplaySelectColumn: ReplayTableColumn = {
 };
 
 export const ReplaySessionColumn: ReplayTableColumn = {
-  Header: t('Replay'),
+  Header: () => (
+    <Tooltip title={t('By default, replays are sorted by time sent.')}>
+      {t('Replay')}
+    </Tooltip>
+  ),
   sortKey: 'started_at',
   width: 'minmax(150px, 1fr)',
   Component: ({replay}) => {