Chore: Update test database initialization (#81673)

* streamline initialization of test databases, support on-disk sqlite test db

* clean up test databases

* introduce testsuite helper

* use testsuite everywhere we use a test db

* update documentation

* improve error handling

* disable entity integration test until we can figure out locking error

pkg/services/extsvcauth/oauthserver/store/database_test.go

@@ -12,8 +12,13 @@ import (
 	"github.com/grafana/grafana/pkg/services/accesscontrol"
 	"github.com/grafana/grafana/pkg/services/extsvcauth/oauthserver"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
+	"github.com/grafana/grafana/pkg/tests/testsuite"
 )
 
+func TestMain(m *testing.M) {
+	testsuite.Run(m)
+}
+
 func TestStore_RegisterAndGetClient(t *testing.T) {
 	s := &store{db: db.InitTestDB(t, db.InitTestDBOpt{FeatureFlags: []string{featuremgmt.FlagExternalServiceAuth}})}
 	tests := []struct {