Remove the legacy CI from source

Author: tuhaihe

.asf.yaml

@@ -52,7 +52,12 @@ github:
         strict: true
         # contexts are the names of checks that must pass.
         contexts:
-          - build_and_unit_test
+          - Build Cloudberry From Source
+          - Cloudberry-backup Tests (unit)
+          - Cloudberry-backup Tests (integration)
+          - Cloudberry-backup Tests (end_to_end)
+          - Cloudberry-backup Tests (s3_plugin_e2e)
+          - Cloudberry-backup Tests (regression)
       required_pull_request_reviews:
         dismiss_stale_reviews: false
         required_approving_review_count: 1