Skip Exclusive Lease Transaction Check for js specs

What does this MR do and why?

When transactional tests are enabled, we may run into issues with Gitlab::ExclusiveLease which is not expected to be run within transactions.

To avoid false positives, disable this check for JavaScript feature specs run.

Similar MR: !163832 (merged)

spec/lib/gitlab/exclusive_lease_spec.rb

@@ -42,6 +42,20 @@
             expect { lease_attempt }.to raise_error(Gitlab::ExclusiveLease::LeaseWithinTransactionError)
           end
         end
+
+        it 'allows the operation if lock thread is set' do
+          described_class.skipping_transaction_check do
+            thread = Thread.new do
+              Thread.current.abort_on_exception = true
+
+              ApplicationRecord.transaction do
+                expect { lease_attempt }.not_to raise_error
+              end
+            end
+
+            thread.join
+          end
+        end
       end
 
       context 'in production environment' do