chore:Disable v3-experimental branch rules

Author: cindy-peng

.github/dependabot.yml

@@ -17,15 +17,4 @@ updates:
     # If a security vulnerability comes in, we will be notified about 
     # it via template in the synthtool repository.
     ignore:
-      - dependency-name: "*"
-      
-  # rules for the `V3-experimental` branch
-  - package-ecosystem: maven
-    directory: "/"
-    schedule:
-      interval: daily
-    commit-message:
-      # Prefix all commit messages with "deps: "
-      prefix: "deps"
-    open-pull-requests-limit: 10
-    target-branch: "V3-experimental"
+      - dependency-name: "*"

.github/sync-repo-settings.yaml

@@ -107,22 +107,6 @@ branchProtectionRules:
       - cla/google
       - 'Kokoro - Test: Java GraalVM Native Image'
       - 'Kokoro - Test: Java 17 GraalVM Native Image'
-  - pattern: V3-experimental
-    isAdminEnforced: true
-    requiredApprovingReviewCount: 1
-    requiresCodeOwnerReviews: true
-    requiresStrictStatusChecks: false
-    requiredStatusCheckContexts:
-      - dependencies (17)
-      - lint
-      - clirr
-      - units (8)
-      - units (11)
-      - 'Kokoro - Test: Integration'
-      - cla/google
-      - 'Kokoro - Test: Java GraalVM Native Image'
-      - 'Kokoro - Test: Java 17 GraalVM Native Image'
-      - javadoc
   - pattern: 2.15.x
     isAdminEnforced: true
     requiredApprovingReviewCount: 1