Add goleak to all tests (#227)

* Run goleak as part of all tests
We are already using goleak in various tests.
This commit adds a TestMain to all remaining tests
and calls goleak.VerifyTestMain in them.
* Add goleak to debugd/deploy package and fix bug.
* Run go mod tidy
* Fix integration tests
* Move goleak invocation for mount integration test
* Ignore leak in state integration tests

Co-authored-by: Fabian Kammel <fk@edgelss.systems>

mount/kms/constellation_test.go

@@ -7,10 +7,15 @@ import (
 
 	"github.com/edgelesssys/constellation/coordinator/vpnapi/vpnproto"
 	"github.com/stretchr/testify/assert"
+	"go.uber.org/goleak"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/test/bufconn"
 )
 
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}
+
 type stubVPNClient struct {
 	getDataKeyErr error
 	dataKey       []byte