chore: make the owlbot postprocessor check non-required (#1654)

Author: diegomarquezp

.github/sync-repo-settings.yaml

@@ -15,7 +15,6 @@ branchProtectionRules:
       - units (11)
       - 'Kokoro - Test: Integration'
       - cla/google
-      - OwlBot Post Processor
       - 'Kokoro - Test: Java GraalVM Native Image'
       - 'Kokoro - Test: Java 17 GraalVM Native Image'
       - javadoc
@@ -33,7 +32,6 @@ branchProtectionRules:
       - units (11)
       - 'Kokoro - Test: Integration'
       - cla/google
-      - OwlBot Post Processor
   - pattern: 3.7.x
     isAdminEnforced: true
     requiredApprovingReviewCount: 1
@@ -48,7 +46,6 @@ branchProtectionRules:
       - units (11)
       - 'Kokoro - Test: Integration'
       - cla/google
-      - OwlBot Post Processor
   - pattern: 3.13.x
     isAdminEnforced: true
     requiredApprovingReviewCount: 1
@@ -63,7 +60,6 @@ branchProtectionRules:
       - units (11)
       - 'Kokoro - Test: Integration'
       - cla/google
-      - OwlBot Post Processor
       - 'Kokoro - Test: Java GraalVM Native Image'
       - 'Kokoro - Test: Java 17 GraalVM Native Image'
 permissionRules: