Fixes for Alloydb E2E tests (#2312)

* Fixes for Alloydb E2E tests

* too long project name in Sipmle example resulted in:
```
Error: "***-alloydb-prj" name must be 4 to 30 characters with lowercase and uppercase letters, numbers, hyphen, single-quote, double-quote, space, and exclamation point.
```

* using self_link resulted in:
```
Error: Error creating Cluster: googleapi: Error 499: malformed network path: "https://www.googleapis.com/compute/v1/projects/***/global/networks/e2e-test"
```

* Cross region replication stil fails with:
```
│ Error: Error creating cluster. Can not create secondary cluster without secondary_config field.
│
│   with module.alloydb.google_alloydb_cluster.secondary[0],
│   on /usr/local/google/home/wiktorn/git/cloud-foundation-fabric/modules/alloydb/main.tf line 199, in resource "google_alloydb_cluster" "secondary":
│  199: resource "google_alloydb_cluster" "secondary" {
```

* Fix tests

---------

Co-authored-by: Julio Castillo <jccb@google.com>

modules/alloydb/README.md

@@ -29,7 +29,7 @@ module "project" {
   source          = "./fabric/modules/project"
   billing_account = var.billing_account_id
   parent          = var.folder_id
-  name            = "alloydb-prj"
+  name            = "alloydb"
   prefix          = var.prefix
   services = [
     "servicenetworking.googleapis.com",
@@ -76,7 +76,7 @@ module "alloydb" {
   location     = var.region
   name         = "db"
   network_config = {
-    network = var.vpc.self_link
+    network = var.vpc.id
   }
   cross_region_replication = {
     enabled = true
@@ -104,7 +104,7 @@ module "alloydb" {
     timezone                            = "'UTC'"
   }
   network_config = {
-    network = var.vpc.self_link
+    network = var.vpc.id
   }
   users = {
     # generate a password for user1
@@ -130,7 +130,7 @@ module "alloydb" {
   location     = var.region
   name         = "primary"
   network_config = {
-    network = var.vpc.self_link
+    network = var.vpc.id
   }
   encryption_config = {
     primary_kms_key_name = var.kms_key.id