chore: remove owlbot check (#4441)

Author: JoeWang1127

.github/sync-repo-settings.yaml

@@ -13,7 +13,6 @@ branchProtectionRules:
       - 'Kokoro - Test: Java 8'
       - 'Kokoro - Test: Beam Integration'
       - cla/google
-      - OwlBot Post Processor
     requiredApprovingReviewCount: 1
     requiresCodeOwnerReviews: true
   - pattern: 1.20.0-sp
@@ -27,7 +26,6 @@ branchProtectionRules:
       - 'Kokoro - Test: Java 8'
       - 'Kokoro - Test: Beam Integration'
       - cla/google
-      - OwlBot Post Processor
     requiredApprovingReviewCount: 1
     requiresCodeOwnerReviews: true
   - pattern: bigtable-1.x
@@ -41,7 +39,6 @@ branchProtectionRules:
       - 'Kokoro - Test: Java 8'
       - 'Kokoro - Test: Beam Integration'
       - cla/google
-      - OwlBot Post Processor
     requiredApprovingReviewCount: 1
     requiresCodeOwnerReviews: true
   - pattern: 1.25.2-sp
@@ -55,7 +52,6 @@ branchProtectionRules:
       - 'Kokoro - Test: Java 8'
       - 'Kokoro - Test: Beam Integration'
       - cla/google
-      - OwlBot Post Processor
     requiredApprovingReviewCount: 1
     requiresCodeOwnerReviews: true
   - pattern: 2.1.x
@@ -69,7 +65,6 @@ branchProtectionRules:
       - 'Kokoro - Test: Java 8'
       - 'Kokoro - Test: Beam Integration'
       - cla/google
-      - OwlBot Post Processor
     requiredApprovingReviewCount: 1
     requiresCodeOwnerReviews: true
   - pattern: 2.6.x
@@ -83,7 +78,6 @@ branchProtectionRules:
       - 'Kokoro - Test: Java 8'
       - 'Kokoro - Test: Beam Integration'
       - cla/google
-      - OwlBot Post Processor
     requiredApprovingReviewCount: 1
     requiresCodeOwnerReviews: true
   - pattern: 2.9.x
@@ -97,7 +91,6 @@ branchProtectionRules:
       - 'Kokoro - Test: Java 8'
       - 'Kokoro - Test: Beam Integration'
       - cla/google
-      - OwlBot Post Processor
     requiredApprovingReviewCount: 1
     requiresCodeOwnerReviews: true
   - pattern: 2.12.x
@@ -111,7 +104,6 @@ branchProtectionRules:
       - 'Kokoro - Test: Java 8'
       - 'Kokoro - Test: Beam Integration'
       - cla/google
-      - OwlBot Post Processor
     requiredApprovingReviewCount: 1
     requiresCodeOwnerReviews: true
   - pattern: 2.13.x
@@ -125,7 +117,6 @@ branchProtectionRules:
       - 'Kokoro - Test: Java 8'
       - 'Kokoro - Test: Beam Integration'
       - cla/google
-      - OwlBot Post Processor
     requiredApprovingReviewCount: 1
     requiresCodeOwnerReviews: true
 permissionRules: