Update data not migrated list of migration tools (#55145)

Author: dpmex4527

data/reusables/enterprise-migration-tool/data-not-migrated.md

@@ -15,6 +15,7 @@
 * References between pull requests and issues in different repositories (see [AUTOTITLE](/get-started/writing-on-github/working-with-advanced-formatting/autolinked-references-and-urls))
 * Remediation states of {% data variables.product.prodname_secret_scanning %} results
 * Repositories owned by user accounts{% ifversion repository-properties %}
+* Repository activity feed
 * Repository properties{% endif %}
 * Repository stars
 * Repository watchers