terraform-provider: warn about microservice version changes (#2730)

* terraform-provider: update data source examples

* terraform-provider: warn about destructive microservice changes

* terraform-provider: use `name` variable

* terraform-provider: only perform pre-apply checks on upgrades

* terraform-provider: fix conditional

* terraform-provider: remove obsolete version checks

terraform-provider-constellation/examples/data-sources/constellation_attestation/data-source.tf

@@ -1,5 +1,7 @@
+data "constellation_image" "example" {} # Fill accordingly for the CSP
+
 data "constellation_attestation" "test" {
   csp                 = "aws"
   attestation_variant = "aws-sev-snp"
-  image_version       = "v2.13.0"
+  image               = data.constellation_image.example.image
 }

terraform-provider-constellation/examples/data-sources/constellation_image/data-source.tf

@@ -1,5 +1,5 @@
 data "constellation_image" "example" {
-  image_version       = "v2.13.0"
+  version             = "v2.13.0"
   attestation_variant = "aws-sev-snp"
   csp                 = "aws"
   region              = "eu-west-1"

terraform-provider-constellation/examples/full/aws_cluster.tf

@@ -39,14 +39,14 @@ resource "random_bytes" "measurement_salt" {
 module "aws_iam" {
   // replace $VERSION with the Constellation version you want to use, e.g., v2.14.0
   source      = "https://github.com/edgelesssys/constellation/releases/download/$VERSION/terraform-module.zip//terraform-module/iam/aws"
-  name_prefix = "constell"
+  name_prefix = local.name
   region      = local.region
 }
 
 module "aws_infrastructure" {
   // replace $VERSION with the Constellation version you want to use, e.g., v2.14.0
   source = "https://github.com/edgelesssys/constellation/releases/download/$VERSION/terraform-module.zip//terraform-module/aws"
-  name   = "constell"
+  name   = local.name
   node_groups = {
     control_plane_default = {
       role          = "control-plane"