Fix ArgumentError in GitGarbageCollectWorker Sidekiq job

When the Gitaly call failed, the exception handling failed
because `method` is expected to have a parameter.

Closes #49096

app/workers/git_garbage_collect_worker.rb

@@ -65,10 +65,10 @@ class GitGarbageCollectWorker
       client.repack_incremental
     end
   rescue GRPC::NotFound => e
-    Gitlab::GitLogger.error("#{method} failed:\nRepository not found")
+    Gitlab::GitLogger.error("#{__method__} failed:\nRepository not found")
     raise Gitlab::Git::Repository::NoRepository.new(e)
   rescue GRPC::BadStatus => e
-    Gitlab::GitLogger.error("#{method} failed:\n#{e}")
+    Gitlab::GitLogger.error("#{__method__} failed:\n#{e}")
     raise Gitlab::Git::CommandError.new(e)
   end

spec/workers/git_garbage_collect_worker_spec.rb

@@ -27,6 +27,12 @@ describe GitGarbageCollectWorker do
         subject.perform(project.id, :gc, lease_key, lease_uuid)
       end
+
+      it 'handles gRPC errors' do
+        expect_any_instance_of(Gitlab::GitalyClient::RepositoryService).to receive(:garbage_collect).and_raise(GRPC::NotFound)
+
+        expect { subject.perform(project.id, :gc, lease_key, lease_uuid) }.to raise_exception(Gitlab::Git::Repository::NoRepository)
+      end
     end
     context 'with different lease than the active one' do