[ci.yaml] Disable packaging_test on release candidates (#124712)

[ci.yaml] Disable packaging_test on release candidates

Author: Casey Hillers

.ci.yaml

@@ -415,6 +415,10 @@ targets:
   - name: Linux flutter_packaging_test
     recipe: packaging/packaging
     timeout: 60
+    enabled_branches:
+      - master
+      - beta
+      - stable
     properties:
       task_name: flutter_packaging
       tags: >
@@ -2741,6 +2745,10 @@ targets:
   - name: Mac flutter_packaging_test
     recipe: packaging/packaging
     timeout: 60
+    enabled_branches:
+      - master
+      - beta
+      - stable
     properties:
       task_name: flutter_packaging
       tags: >
@@ -2749,6 +2757,10 @@ targets:
   - name: Mac_arm64 flutter_packaging_test
     recipe: packaging/packaging
     timeout: 60
+    enabled_branches:
+      - master
+      - beta
+      - stable
     properties:
       task_name: flutter_packaging
       tags: >
@@ -4911,6 +4923,10 @@ targets:
   - name: Windows flutter_packaging_test
     recipe: packaging/packaging
     timeout: 60
+    enabled_branches:
+      - master
+      - beta
+      - stable
     properties:
       task_name: flutter_packaging
       tags: >