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/tests/testinfra/testinfra.go

@@ -50,9 +50,8 @@ func StartGrafanaEnv(t *testing.T, grafDir, cfgPath string) (string, *server.Tes
 	serverOpts := server.Options{Listener: listener, HomePath: grafDir}
 	apiServerOpts := api.ServerOptions{Listener: listener}
 
-	env, err := server.InitializeForTest(cfg, serverOpts, apiServerOpts)
+	env, err := server.InitializeForTest(t, cfg, serverOpts, apiServerOpts)
 	require.NoError(t, err)
-	require.NoError(t, env.SQLStore.Sync())
 
 	require.NotNil(t, env.SQLStore.Cfg)
 	dbSec, err := env.SQLStore.Cfg.Raw.GetSection("database")
@@ -99,21 +98,6 @@ func StartGrafanaEnv(t *testing.T, grafDir, cfgPath string) (string, *server.Tes
 	return addr, env
 }
 
-// SetUpDatabase sets up the Grafana database.
-func SetUpDatabase(t *testing.T, grafDir string) *sqlstore.SQLStore {
-	t.Helper()
-
-	sqlStore := db.InitTestDB(t, sqlstore.InitTestDBOpt{
-		EnsureDefaultOrgAndUser: true,
-	})
-
-	// Make sure changes are synced with other goroutines
-	err := sqlStore.Sync()
-	require.NoError(t, err)
-
-	return sqlStore
-}
-
 // CreateGrafDir creates the Grafana directory.
 // The log by default is muted in the regression test, to activate it, pass option EnableLog = true
 func CreateGrafDir(t *testing.T, opts ...GrafanaOpts) (string, string) {