feat(coderd/notifications): group workspace build failure report (#17306)

Closes https://github.com/coder/coder/issues/15745

Instead of sending X many reports to a single template admin, we instead
send only 1.

coderd/database/queries/workspacebuilds.sql

@@ -213,6 +213,7 @@ SELECT
 	tv.name AS template_version_name,
 	u.username AS workspace_owner_username,
 	w.name AS workspace_name,
+	w.id AS workspace_id,
 	wb.build_number AS workspace_build_number
 FROM
 	workspace_build_with_user AS wb