test(e2e): restore a person's full backup into their recreated account

The backup journey restored a snapshot over the account it came from. A
fifth act now follows the runbook's new-host path: a second account writes a
reading and a mood entry and downloads its full backup from the export card,
the account is recreated empty under the same id, the admin uploads the file
in the backups console and restores it, and the person signs in to the same
rows under the same ids. The restore wait is shared by both restores.

src/__tests__/e2e-critical-no-api-stub-guard.test.ts

@@ -50,7 +50,7 @@ const E2E = join(process.cwd(), "e2e");
  * somebody should see here. It counts title literals in the source, so a
  * title written once inside a loop counts once however many tests it names.
  */
-const CRITICAL_TEST_FLOOR = 15;
+const CRITICAL_TEST_FLOOR = 16;
 
 /** A test whose title literal carries the tag, however the call is spelled. */
 const CRITICAL_TEST =