Fix E2E test failures for Cloud Run v2, KMS, Compute VM, and update GEMINI.md (#3953)

* Update Cloud Run v2 GPU examples in README

Remove launch_stage = "BETA" from examples as it now defaults to GA in the provider. This fixes E2E test failures where the API returns GA. Reference: https://github.com/hashicorp/terraform-provider-google/pull/17029

TAG=agy

* Fix KMS and Compute VM E2E test failures

Update README examples to avoid conflicts and unsupported modes, and update corresponding inventories.

TAG=agy

* Add instruction to run a single specific example test in GEMINI.md

TAG=agy

modules/cloud-run-v2/README.md

@@ -887,11 +887,10 @@ GPU support is available for all types of Cloud Run resources: jobs, services an
 
 ```hcl
 module "job" {
-  source       = "./fabric/modules/cloud-run-v2"
-  project_id   = var.project_id
-  name         = "example-job"
-  region       = var.region
-  launch_stage = "BETA"
+  source     = "./fabric/modules/cloud-run-v2"
+  project_id = var.project_id
+  name       = "example-job"
+  region     = var.region
   revision = {
     gpu_zonal_redundancy_disabled = true
     node_selector = {
@@ -950,11 +949,10 @@ module "service" {
 
 ```hcl
 module "worker" {
-  source       = "./fabric/modules/cloud-run-v2"
-  project_id   = var.project_id
-  name         = "worker"
-  region       = var.region
-  launch_stage = "BETA"
+  source     = "./fabric/modules/cloud-run-v2"
+  project_id = var.project_id
+  name       = "worker"
+  region     = var.region
   revision = {
     gpu_zonal_redundancy_disabled = true
     node_selector = {

modules/compute-vm/README.md

@@ -318,7 +318,6 @@ module "vm-disk-options-example" {
       }
     }
     data2 = {
-      mode = "READ_ONLY"
       initialize_params = {
         type = "hyperdisk-balanced"
         hyperdisk = {

modules/kms/README.md

@@ -57,7 +57,7 @@ module "kms" {
         key-b-iam1 = {
           key    = "key-b"
           member = "group:${var.group_email}"
-          role   = "roles/cloudkms.cryptoKeyEncrypterDecrypter"
+          role   = "roles/cloudkms.viewer"
         }
       }
     }