s3: optimize DELETE by skipping lock check for buckets without Object Lock (#7642)

This optimization avoids an expensive filer gRPC call for every DELETE
operation on buckets that don't have Object Lock enabled.

Before this change, enforceObjectLockProtections() would always call
getObjectEntry() to fetch object metadata to check for retention/legal
hold, even for buckets that never had Object Lock configured.

Changes:
1. Add early return in enforceObjectLockProtections() if bucket has no
   Object Lock config or bucket doesn't exist
2. Add isObjectLockEnabled() helper function to check if a bucket has
   Object Lock configured
3. Fix validateObjectLockHeaders() to check ObjectLockConfig instead of
   just versioningEnabled - this ensures object-lock headers are properly
   rejected on buckets without Object Lock enabled, which aligns with
   AWS S3 semantics
4. Make bucket creation with Object Lock atomic - set Object Lock config
   in the same CreateEntry call as bucket creation, preventing race
   conditions where bucket exists without Object Lock enabled
5. Properly handle Object Lock setup failures during bucket creation -
   if StoreObjectLockConfigurationInExtended fails, roll back the bucket
   creation and return an error instead of leaving a bucket without
   the requested Object Lock configuration

This significantly improves DELETE latency for non-Object-Lock buckets,
which is the common case (lockCheck time reduced from 1-10ms to ~1µs).

weed/s3api/s3api_object_retention.go

@@ -586,10 +586,26 @@ func (s3a *S3ApiServer) evaluateGovernanceBypassRequest(r *http.Request, bucket,
 
 // enforceObjectLockProtections enforces object lock protections for operations
 func (s3a *S3ApiServer) enforceObjectLockProtections(request *http.Request, bucket, object, versionId string, governanceBypassAllowed bool) error {
+	// Quick check: if bucket doesn't have Object Lock enabled, skip the expensive entry lookup
+	// This optimization avoids a filer gRPC call for every DELETE operation on buckets without Object Lock
+	objectLockEnabled, err := s3a.isObjectLockEnabled(bucket)
+	if err != nil {
+		if errors.Is(err, filer_pb.ErrNotFound) {
+			// Bucket does not exist, so no protections to enforce
+			return nil
+		}
+		// For other errors, we can't determine lock status, so we should fail.
+		glog.Errorf("enforceObjectLockProtections: failed to check object lock for bucket %s: %v", bucket, err)
+		return err
+	}
+	if !objectLockEnabled {
+		// Object Lock is not enabled on this bucket, no protections to enforce
+		return nil
+	}
+
 	// Get the object entry to check both retention and legal hold
 	// For delete operations without versionId, we need to check the latest version
 	var entry *filer_pb.Entry
-	var err error
 
 	if versionId != "" {
 		// Check specific version