Revert "ReceiveCommits: Retry inserting changes and patch sets"

This reverts commit 7f3121bec4.

Reason for revert: The retrying doesn't work and always fails with
"java.lang.IllegalArgumentException: cannot chain ref update" and as
a result the user gets non-understandable error message.

Change-Id: I6a5c8ea4aabaf2cafba7a551cb6a1156c2751948

java/com/google/gerrit/server/git/receive/ReceiveCommits.java

@@ -952,17 +952,9 @@ class ReceiveCommits {
         updateGroups.forEach(r -> r.addOps(bu));
 
         logger.atFine().log("Executing batch");
-
         try {
-          retryHelper
+          bu.execute();
-              .changeUpdate(
+        } catch (UpdateException e) {
-                  "insertChangesAndPatchSets",
-                  () -> {
-                    bu.execute();
-                    return null;
-                  })
-              .call();
-        } catch (Exception e) {
           throw asRestApiException(e);
         }