auth: Remove org preferences validation (#2433)

* Remove the validation for theme and timezone

* Upodate docs

Author: linoman

docs/data-sources/organization_preferences.md

@@ -28,6 +28,6 @@ data "grafana_organization_preferences" "test" {}
 
 - `home_dashboard_uid` (String) The Organization home dashboard UID. This is only available in Grafana 9.0+.
 - `id` (String) The ID of this resource.
-- `theme` (String) The Organization theme. Available values are `light`, `dark`, `system`, or an empty string for the default.
-- `timezone` (String) The Organization timezone. Available values are `utc`, `browser`, or an empty string for the default.
+- `theme` (String) The Organization theme. Any string value is supported, including custom themes. Common values are `light`, `dark`, `system`, or an empty string for the default.
+- `timezone` (String) The Organization timezone. Any string value is supported, including IANA timezone names. Common values are `utc`, `browser`, or an empty string for the default.
 - `week_start` (String) The Organization week start day. Available values are `sunday`, `monday`, `saturday`, or an empty string for the default.

docs/resources/organization_preferences.md

@@ -28,8 +28,8 @@ resource "grafana_organization_preferences" "test" {
 
 - `home_dashboard_uid` (String) The Organization home dashboard UID. This is only available in Grafana 9.0+.
 - `org_id` (String) The Organization ID. If not set, the Org ID defined in the provider block will be used.
-- `theme` (String) The Organization theme. Available values are `light`, `dark`, `system`, or an empty string for the default.
-- `timezone` (String) The Organization timezone. Available values are `utc`, `browser`, or an empty string for the default.
+- `theme` (String) The Organization theme. Any string value is supported, including custom themes. Common values are `light`, `dark`, `system`, or an empty string for the default.
+- `timezone` (String) The Organization timezone. Any string value is supported, including IANA timezone names. Common values are `utc`, `browser`, or an empty string for the default.
 - `week_start` (String) The Organization week start day. Available values are `sunday`, `monday`, `saturday`, or an empty string for the default. Defaults to ``.
 
 ### Read-Only

internal/resources/grafana/resource_organization_preferences.go

@@ -31,21 +31,19 @@ func resourceOrganizationPreferences() *common.Resource {
 		Schema: map[string]*schema.Schema{
 			"org_id": orgIDAttribute(),
 			"theme": {
-				Type:         schema.TypeString,
-				Optional:     true,
-				Description:  "The Organization theme. Available values are `light`, `dark`, `system`, or an empty string for the default.",
-				ValidateFunc: validation.StringInSlice([]string{"light", "dark", "system", ""}, false),
+				Type:        schema.TypeString,
+				Optional:    true,
+				Description: "The Organization theme. Any string value is supported, including custom themes. Common values are `light`, `dark`, `system`, or an empty string for the default.",
 			},
 			"home_dashboard_uid": {
 				Type:        schema.TypeString,
 				Optional:    true,
 				Description: "The Organization home dashboard UID. This is only available in Grafana 9.0+.",
 			},
 			"timezone": {
-				Type:         schema.TypeString,
-				Optional:     true,
-				Description:  "The Organization timezone. Available values are `utc`, `browser`, or an empty string for the default.",
-				ValidateFunc: validation.StringInSlice([]string{"utc", "browser", ""}, false),
+				Type:        schema.TypeString,
+				Optional:    true,
+				Description: "The Organization timezone. Any string value is supported, including IANA timezone names. Common values are `utc`, `browser`, or an empty string for the default.",
 			},
 			"week_start": {
 				Type:         schema.TypeString,