fix: refactor sqlserver to handle encryption correctly (#31)

## Description

<!-- **Please link some issue here describing what you are trying to achieve.**

In case there is no issue present for your PR, please consider creating one.
At least please give us some description what you are trying to achieve and why your change is needed. -->

relates to #1234

## Checklist

- [ ] Issue was linked above
- [ ] Code format was applied: `make fmt`
- [ ] Examples were added / adjusted (see `examples/` directory)
- [x] Docs are up-to-date: `make generate-docs` (will be checked by CI)
- [ ] Unit tests got implemented or updated
- [ ] Acceptance tests got implemented or updated (see e.g. [here](f5f99d1709/stackit/internal/services/dns/dns_acc_test.go))
- [x] Unit tests are passing: `make test` (will be checked by CI)
- [x] No linter issues: `make lint` (will be checked by CI)

Reviewed-on: #31
Reviewed-by: Andre_Harms <andre.harms@stackit.cloud>

docs/data-sources/sqlserverflexalpha_instance.md

@@ -3,12 +3,12 @@
 page_title: "stackitprivatepreview_sqlserverflexalpha_instance Data Source - stackitprivatepreview"
 subcategory: ""
 description: |-
-  SQLServer Flex ALPHA instance resource schema. Must have a region specified in the provider configuration.
+  
 ---
 
 # stackitprivatepreview_sqlserverflexalpha_instance (Data Source)
 
-SQLServer Flex ALPHA instance resource schema. Must have a `region` specified in the provider configuration.
+
 
 ## Example Usage
 
@@ -24,61 +24,48 @@ data "stackitprivatepreview_sqlserverflexalpha_instance" "example" {
 
 ### Required
 
-- `instance_id` (String) ID of the SQLServer Flex instance.
-- `project_id` (String) STACKIT project ID to which the instance is associated.
-
-### Optional
-
-- `region` (String) The resource region. If not defined, the provider region is used.
+- `instance_id` (String) The ID of the instance.
+- `project_id` (String) The STACKIT project ID.
+- `region` (String) The region which should be addressed
 
 ### Read-Only
 
-- `backup_schedule` (String) The backup schedule. Should follow the cron scheduling system format (e.g. "0 0 * * *")
-- `edition` (String)
-- `encryption` (Attributes) The encryption block. (see [below for nested schema](#nestedatt--encryption))
-- `flavor` (Attributes) (see [below for nested schema](#nestedatt--flavor))
-- `id` (String) Terraform's internal resource ID. It is structured as "`project_id`,`region`,`instance_id`".
-- `is_deletable` (Boolean)
-- `name` (String) Instance name.
-- `network` (Attributes) The network block. (see [below for nested schema](#nestedatt--network))
-- `replicas` (Number)
-- `retention_days` (Number)
+- `backup_schedule` (String) The schedule for on what time and how often the database backup will be created. The schedule is written as a cron schedule.
+- `edition` (String) Edition of the MSSQL server instance
+- `encryption` (Attributes) this defines which key to use for storage encryption (see [below for nested schema](#nestedatt--encryption))
+- `flavor_id` (String) The id of the instance flavor.
+- `id` (String) The ID of the instance.
+- `is_deletable` (Boolean) Whether the instance can be deleted or not.
+- `name` (String) The name of the instance.
+- `network` (Attributes) The access configuration of the instance (see [below for nested schema](#nestedatt--network))
+- `replicas` (Number) How many replicas the instance should have.
+- `retention_days` (Number) The days for how long the backup files should be stored before cleaned up. 30 to 365
 - `status` (String)
-- `storage` (Attributes) (see [below for nested schema](#nestedatt--storage))
-- `version` (String)
+- `storage` (Attributes) The object containing information about the storage size and class. (see [below for nested schema](#nestedatt--storage))
+- `version` (String) The sqlserver version used for the instance.
 
 <a id="nestedatt--encryption"></a>
 ### Nested Schema for `encryption`
 
 Read-Only:
 
-- `key_id` (String) STACKIT KMS - Key ID of the encryption key to use.
-- `key_version` (String) STACKIT KMS - Key version to use in the encryption key.
-- `keyring_id` (String) STACKIT KMS - KeyRing ID of the encryption key to use.
+- `kek_key_id` (String) The key identifier
+- `kek_key_ring_id` (String) The keyring identifier
+- `kek_key_version` (String) The key version
 - `service_account` (String)
 
 
-<a id="nestedatt--flavor"></a>
-### Nested Schema for `flavor`
-
-Read-Only:
-
-- `cpu` (Number)
-- `description` (String)
-- `id` (String)
-- `node_type` (String)
-- `ram` (Number)
-
-
 <a id="nestedatt--network"></a>
 ### Nested Schema for `network`
 
 Read-Only:
 
-- `access_scope` (String) The access scope of the instance. (e.g. SNA)
-- `acl` (List of String) The Access Control List (ACL) for the SQLServer Flex instance.
-- `instance_address` (String) The returned instance IP address of the SQLServer Flex instance.
-- `router_address` (String) The returned router IP address of the SQLServer Flex instance.
+- `access_scope` (String) The network access scope of the instance
+
+⚠️ **Note:** This feature is in private preview. Supplying this object is only permitted for enabled accounts. If your account does not have access, the request will be rejected.
+- `acl` (List of String) List of IPV4 cidr.
+- `instance_address` (String)
+- `router_address` (String)
 
 
 <a id="nestedatt--storage"></a>
@@ -86,5 +73,5 @@ Read-Only:
 
 Read-Only:
 
-- `class` (String)
-- `size` (Number)
+- `class` (String) The storage class for the storage.
+- `size` (Number) The storage size in Gigabytes.