fix(postgresflex): remove the role validation for postgresflex user (#1116)

relates to #1105

Author: Agraphie

docs/resources/postgresflex_user.md

@@ -34,7 +34,7 @@ import {
 
 - `instance_id` (String) ID of the PostgresFlex instance.
 - `project_id` (String) STACKIT project ID to which the instance is associated.
-- `roles` (Set of String) Database access levels for the user. Possible values are: `login`, `createdb`.
+- `roles` (Set of String) Database access levels for the user.
 - `username` (String)
 
 ### Optional

stackit/internal/services/postgresflex/user/resource.go

@@ -8,8 +8,6 @@ import (
 
 	postgresflexUtils "github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/postgresflex/utils"
 
-	"github.com/hashicorp/terraform-plugin-framework-validators/setvalidator"
-	"github.com/hashicorp/terraform-plugin-framework-validators/stringvalidator"
 	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 	"github.com/stackitcloud/terraform-provider-stackit/stackit/internal/conversion"
@@ -115,15 +113,13 @@ func (r *userResource) Configure(ctx context.Context, req resource.ConfigureRequ
 
 // Schema defines the schema for the resource.
 func (r *userResource) Schema(_ context.Context, _ resource.SchemaRequest, resp *resource.SchemaResponse) {
-	rolesOptions := []string{"login", "createdb"}
-
 	descriptions := map[string]string{
 		"main":        "Postgres Flex user resource schema. Must have a `region` specified in the provider configuration.",
 		"id":          "Terraform's internal resource ID. It is structured as \"`project_id`,`region`,`instance_id`,`user_id`\".",
 		"user_id":     "User ID.",
 		"instance_id": "ID of the PostgresFlex instance.",
 		"project_id":  "STACKIT project ID to which the instance is associated.",
-		"roles":       "Database access levels for the user. " + utils.FormatPossibleValues(rolesOptions...),
+		"roles":       "Database access levels for the user.",
 		"region":      "The resource region. If not defined, the provider region is used.",
 	}
 
@@ -181,11 +177,6 @@ func (r *userResource) Schema(_ context.Context, _ resource.SchemaRequest, resp
 				Description: descriptions["roles"],
 				ElementType: types.StringType,
 				Required:    true,
-				Validators: []validator.Set{
-					setvalidator.ValueStringsAre(
-						stringvalidator.OneOf("login", "createdb"),
-					),
-				},
 			},
 			"password": schema.StringAttribute{
 				Computed:  true,