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/pluginsintegration/plugins_integration_test.go

@@ -22,6 +22,7 @@ import (
 	"github.com/grafana/grafana/pkg/services/pluginsintegration/pluginstore"
 	"github.com/grafana/grafana/pkg/services/searchV2"
 	"github.com/grafana/grafana/pkg/setting"
+	"github.com/grafana/grafana/pkg/tests/testsuite"
 	"github.com/grafana/grafana/pkg/tsdb/azuremonitor"
 	cloudmonitoring "github.com/grafana/grafana/pkg/tsdb/cloud-monitoring"
 	"github.com/grafana/grafana/pkg/tsdb/cloudwatch"
@@ -41,6 +42,10 @@ import (
 	"github.com/grafana/grafana/pkg/tsdb/tempo"
 )
 
+func TestMain(m *testing.M) {
+	testsuite.Run(m)
+}
+
 func TestIntegrationPluginManager(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test")