Fix E2E tests.

* Disable tests for VPC connector and Cloud Functions, CFs are not
  supporrted in the default region
* fix permissions to secrets for Cloud Run
* add permissions admin permissions to any SA within project to
  `var.bucket`
* add permissions to access the secret to any SA within project to
  secrets created by fixture
* disable custom roles in E2E tests, as `var.organization_id` is not the
  same org, within which projects are created in E2E

modules/cloud-run-v2/README.md

@@ -493,9 +493,7 @@ module "secrets" {
   secrets = {
     otel-config = {
       iam = {
-        "roles/secretmanager.secretAccessor" = [
-          "serviceAccount:${var.project_number}-compute@developer.gserviceaccount.com"
-        ]
+        "roles/secretmanager.secretAccessor" = [module.cloud_run.service_account_iam_email]
       }
       versions = {
         v1 = {