chore: remove parallel running in integration tests (#8904)

# Which Problems Are Solved

Integration tests are flaky due to eventual consistency.

# How the Problems Are Solved

Remove t.Parallel so that less concurrent requests on multiple instance
happen. This allows the projections to catch up more easily.

# Additional Changes

- none

# Additional Context

- none

internal/api/grpc/admin/integration_test/iam_settings_test.go

@@ -18,8 +18,6 @@ import (
 )
 
 func TestServer_GetSecurityPolicy(t *testing.T) {
-	t.Parallel()
-
 	instance := integration.NewInstance(CTX)
 	adminCtx := instance.WithAuthorization(CTX, integration.UserTypeIAMOwner)
 
@@ -72,8 +70,6 @@ func TestServer_GetSecurityPolicy(t *testing.T) {
 }
 
 func TestServer_SetSecurityPolicy(t *testing.T) {
-	t.Parallel()
-
 	instance := integration.NewInstance(CTX)
 	adminCtx := instance.WithAuthorization(CTX, integration.UserTypeIAMOwner)
 

internal/api/grpc/admin/integration_test/restrictions_allow_public_org_registrations_test.go

@@ -21,8 +21,6 @@ import (
 )
 
 func TestServer_Restrictions_DisallowPublicOrgRegistration(t *testing.T) {
-	t.Parallel()
-
 	instance := integration.NewInstance(CTX)
 	regOrgUrl, err := url.Parse("http://" + instance.Domain + ":8080/ui/login/register/org")
 	require.NoError(t, err)

internal/api/grpc/admin/integration_test/restrictions_allowed_languages_test.go

@@ -24,8 +24,6 @@ import (
 )
 
 func TestServer_Restrictions_AllowedLanguages(t *testing.T) {
-	t.Parallel()
-
 	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Minute)
 	defer cancel()