storage_discovery_workspace: address reviewer feedback

- Convert resource to typed SDK resource pattern (sdk.Resource interface)
- Add name validation function consistent with portal (3-63 chars, alphanumeric and hyphens)
- Change workspace_roots to workspace_root (singular) and TypeList to TypeSet
- Add MaxItems: 100 for workspace_root
- Add CustomizeDiff to validate subscription vs resource group ID conflicts
- Update all references in expand/flatten functions, tests, and documentation

Author: hqhqhqhqhqhqhqhqhqhqhq

internal/services/storage/registration.go

@@ -62,7 +62,6 @@ func (r Registration) SupportedResources() map[string]*pluginsdk.Resource {
 		"azurerm_storage_container":                    resourceStorageContainer(),
 		"azurerm_storage_data_lake_gen2_filesystem":    resourceStorageDataLakeGen2FileSystem(),
 		"azurerm_storage_data_lake_gen2_path":          resourceStorageDataLakeGen2Path(),
-		"azurerm_storage_discovery_workspace":          resourceStorageDiscoveryWorkspace(),
 		"azurerm_storage_encryption_scope":             resourceStorageEncryptionScope(),
 		"azurerm_storage_management_policy":            resourceStorageManagementPolicy(),
 		"azurerm_storage_object_replication":           resourceStorageObjectReplication(),
@@ -92,6 +91,7 @@ func (r Registration) Resources() []sdk.Resource {
 		AccountStaticWebsiteResource{},
 		LocalUserResource{},
 		StorageContainerImmutabilityPolicyResource{},
+		StorageDiscoveryWorkspaceResource{},
 		SyncServerEndpointResource{},
 	}
 }