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/user/v2beta/integration_test/email_test.go

@@ -17,8 +17,6 @@ import (
 )
 
 func TestServer_SetEmail(t *testing.T) {
-	t.Parallel()
-
 	userID := Instance.CreateHumanUser(CTX).GetUserId()
 
 	tests := []struct {
@@ -148,8 +146,6 @@ func TestServer_SetEmail(t *testing.T) {
 }
 
 func TestServer_ResendEmailCode(t *testing.T) {
-	t.Parallel()
-
 	userID := Instance.CreateHumanUser(CTX).GetUserId()
 	verifiedUserID := Instance.CreateHumanUserVerified(CTX, Instance.DefaultOrg.Id, gofakeit.Email()).GetUserId()
 
@@ -254,8 +250,6 @@ func TestServer_ResendEmailCode(t *testing.T) {
 }
 
 func TestServer_VerifyEmail(t *testing.T) {
-	t.Parallel()
-
 	userResp := Instance.CreateHumanUser(CTX)
 	tests := []struct {
 		name    string