Add missing run-name to maintenance-fast.yml on main branch

The maintenance-fast.yml file on main branch was missing the run-name field,
causing it to show as filename instead of friendly name "Maintenance Push – Fast"
in the GitHub Actions workflow list.

This matches the run-name format used in main-push-fast.yml.

Signed-off-by: Mark Pollack <[email protected]>

Author: markpollack

.github/workflows/maintenance-fast.yml

@@ -1,4 +1,5 @@
 name: Maintenance Push – Fast
+run-name: ${{ github.event.inputs.commit_sha && format('Manual Test - {0}', github.event.inputs.commit_sha) || format('Fast Build - {0}', github.sha) }}
 
 on:
   push: