<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#37806
Removed `ds.ListActivities` from the legacy datastore and updated
code/tests to use the new activity bounded context instead.
The changes to `cron.go` and most changes to `mysql/activities_test.go`
will eventually be migrated to the activity bounded context. The current
changes are an intermediate step.
The issues tracked by https://github.com/fleetdm/fleet/issues/38234 will
be addressed in additional/parallel PRs shortly.
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
- Done in the previous PR
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Migrated activity retrieval from direct datastore calls to a
service-based architecture for improved maintainability and consistency.
* Enhanced system context handling for background automation tasks to
ensure proper authorization during scheduled operations.
* Streamlined activity recording for automated processes with dedicated
system identity tracking.
* **Tests**
* Updated test infrastructure with new helpers for activity service
integration across test suites.
<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Ian Littman <iansltx@gmail.com>
<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#34389
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements)
## Testing
- [x] Added/updated automated tests
- [x] Where appropriate, [automated tests simulate multiple hosts and
test for host
isolation](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/reference/patterns-backend.md#unit-testing)
(updates to one hosts's records do not affect another)
- [x] QA'd all new/changed functionality manually
## Database migrations
- [x] Checked schema for all modified table for columns that will
auto-update timestamps during migration.
- [x] Ensured the correct collation is explicitly set for character
columns (`COLLATE utf8mb4_unicode_ci`).
