[SPARK-53815] Remove branch-0.4 from daily publish_snapshot_* GitHub Action jobs

Author: dongjoon-hyun

.github/workflows/publish_snapshot_chart.yml

@@ -10,7 +10,7 @@ on:
         description: 'list of branches to publish (JSON)'
         required: true
         # keep in sync with default value of strategy matrix 'branch'
-        default: '["main", "branch-0.4"]'
+        default: '["main"]'
 
 jobs:
   publish-snapshot-chart:

.github/workflows/publish_snapshot_dockerhub.yml

@@ -10,7 +10,7 @@ on:
         description: 'list of branches to publish (JSON)'
         required: true
         # keep in sync with default value of strategy matrix 'branch'
-        default: '["main", "branch-0.4"]'
+        default: '["main"]'
 
 jobs:
   publish-snapshot-image: