Chore: Ensure we save correct default admin user in integration test DB setup (#105752)

* fix helper + amend tests

* fix import + remove unused var

* remove more users

* remove unused code

* update test comment

pkg/tests/api/alerting/api_ruler_pause_test.go

@@ -27,13 +27,6 @@ func TestIntegrationAlertRulePauseNamespace(t *testing.T) {
 
 	grafanaListedAddr, env := testinfra.StartGrafanaEnv(t, dir, p)
 
-	// Create a user to make authenticated requests
-	createUser(t, env.SQLStore, env.Cfg, user.CreateUserCommand{
-		DefaultOrgRole: string(org.RoleAdmin),
-		Password:       "admin",
-		Login:          "admin",
-	})
-
 	createUser(t, env.SQLStore, env.Cfg, user.CreateUserCommand{
 		DefaultOrgRole: string(org.RoleViewer),
 		Password:       "viewer",