Introduce a new configuration parameter,
`CHANGELOG_RETAIN_CREATE_LAST_UPDATE`, to retain each object's create
record and most recent update record when pruning expired changelog
entries (per `CHANGELOG_RETENTION`).
Update documentation, templates, and forms to reflect this change.
Fixes#21409
- Updated menu path from 'Admin > Extras > Configuration Revisions'
to 'Admin > System > Configuration History'
- Reflects actual location in NetBox admin interface
* Change references to admin UI to Admin menu
* Change also for reports and custom scripts
* Minor tweaks to help text flow better
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Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>
