docs: mention end-to-end test debugging for migration scripts (#833)

## PR Checklist

- [x] Addresses an existing open issue: fixes #832
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/create-typescript-app/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/create-typescript-app/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

Mentions the steps I found necessary in `.github/DEVELOPMENT.md`.

Author: JoshuaKGoldberg

.github/DEVELOPMENT.md

@@ -194,3 +194,7 @@ That end-to-end test executes `script/migrate-test-e2e.js`, which:
 
 The `pnpm run test:migrate` script is run in CI to ensure that templating changes are in sync with the template's actual files.
 See `.github/workflows/test-migrate.yml`.
+
+> Tip: if the migration test is failing in CI and you don't see any errors, try [downloading the full logs](https://docs.github.com/en/actions/monitoring-and-troubleshooting-workflows/using-workflow-run-logs#downloading-logs).
+> There'll likely be a list of changed files under a message like _`Oh no! Running the migrate script modified some files:`_.
+> You can also try running the test script locally.