Support project UUID identifier in resource manager project (#161)

* Add projectId to resource manager project, fix value conversion error

* Support both uuid and container id, update acceptance tests

* Update docs

* Fix unit tests

* Adapt acc test names

docs/data-sources/resourcemanager_project.md

@@ -3,12 +3,12 @@
 page_title: "stackit_resourcemanager_project Data Source - stackit"
 subcategory: ""
 description: |-
-  Resource Manager project data source schema.
+  Resource Manager project data source schema. To identify the project, you need to provider either projectid or containerid. If you provide both, project_id will be used.
 ---
 
 # stackit_resourcemanager_project (Data Source)
 
-Resource Manager project data source schema.
+Resource Manager project data source schema. To identify the project, you need to provider either project_id or container_id. If you provide both, project_id will be used.
 
 ## Example Usage
 
@@ -22,13 +22,14 @@ data "stackit_resourcemanager_project" "example" {
 <!-- schema generated by tfplugindocs -->
 ## Schema
 
-### Required
+### Optional
 
-- `container_id` (String) Project container ID.
+- `container_id` (String) Project container ID. Globally unique, user-friendly identifier.
+- `project_id` (String) Project UUID identifier. This is the ID that can be used in most of the other resources to identify the project.
 
 ### Read-Only
 
 - `id` (String) Terraform's internal data source. ID. It is structured as "`container_id`".
 - `labels` (Map of String) Labels are key-value string pairs which can be attached to a resource container. A label key must match the regex [A-ZÄÜÖa-zäüöß0-9_-]{1,64}. A label value must match the regex ^$|[A-ZÄÜÖa-zäüöß0-9_-]{1,64}
 - `name` (String) Project name.
-- `parent_container_id` (String) Parent container ID
+- `parent_container_id` (String) Parent resource identifier. Both container ID (user-friendly) and UUID are supported

docs/index.md

@@ -131,7 +131,7 @@ Using this flow is less secure since the token is long-lived. You can provide th
 - `region` (String) Region will be used as the default location for regional services. Not all services require a region, some are global
 - `resourcemanager_custom_endpoint` (String) Custom endpoint for the Resource Manager service
 - `secretsmanager_custom_endpoint` (String) Custom endpoint for the Secrets Manager service
-- `service_account_email` (String) Service account email. It can also be set using the environment variable STACKIT_SERVICE_ACCOUNT_EMAIL
+- `service_account_email` (String) Service account email. It can also be set using the environment variable STACKIT_SERVICE_ACCOUNT_EMAIL. It is required if you want to use the resource manager project resource.
 - `service_account_key` (String) Service account key used for authentication. If set alongside private key, the key flow will be used to authenticate all operations.
 - `service_account_key_path` (String) Path for the service account key used for authentication. If set alongside the private key, the key flow will be used to authenticate all operations.
 - `service_account_token` (String) Token used for authentication. If set, the token flow will be used to authenticate all operations.

docs/resources/resourcemanager_project.md

@@ -3,12 +3,12 @@
 page_title: "stackit_resourcemanager_project Resource - stackit"
 subcategory: ""
 description: |-
-  Resource Manager project resource schema.
+  Resource Manager project resource schema. To use this resource, it is required that you set the service account email in the provider configuration.
 ---
 
 # stackit_resourcemanager_project (Resource)
 
-Resource Manager project resource schema.
+Resource Manager project resource schema. To use this resource, it is required that you set the service account email in the provider configuration.
 
 ## Example Usage
 
@@ -31,7 +31,7 @@ resource "stackit_resourcemanager_project" "example" {
 
 - `name` (String) Project name.
 - `owner_email` (String) Email address of the owner of the project. This value is only considered during creation. Changing it afterwards will have no effect.
-- `parent_container_id` (String) Parent container ID
+- `parent_container_id` (String) Parent resource identifier. Both container ID (user-friendly) and UUID are supported
 
 ### Optional
 
@@ -41,3 +41,4 @@ resource "stackit_resourcemanager_project" "example" {
 
 - `container_id` (String) Project container ID. Globally unique, user-friendly identifier.
 - `id` (String) Terraform's internal resource ID. It is structured as "`container_id`".
+- `project_id` (String) Project UUID identifier. This is the ID that can be used in most of the other resources to identify the project.

docs/resources/ske_cluster.md

@@ -111,9 +111,12 @@ Optional:
 
 Required:
 
-- `allowed_cidrs` (List of String) Specify a list of CIDRs to whitelist.
 - `enabled` (Boolean) Is ACL enabled?
 
+Optional:
+
+- `allowed_cidrs` (List of String) Specify a list of CIDRs to whitelist.
+
 
 <a id="nestedatt--extensions--argus"></a>
 ### Nested Schema for `extensions.argus`