feat(projectHistoryLogs): remove audit logs according to constance configuration TASK-972

[Guitlle]

Checklist

1. If you've added code that should be tested, add tests
2. If you've changed APIs, update (or create!) the documentation
3. Ensure the tests pass
4. Run ./python-format.sh to make sure that your code lints and that you've followed our coding style
5. Write a title and, if necessary, a description of your work suitable for publishing in our release notes
6. Mention any related issues in this repository (as #ISSUE) and in other repositories (as kobotoolbox/other#ISSUE)
7. Open an issue in the docs if there are UI/UX changes
8. Create a testing plan for the reviewer and add it to the Testing section
9. Add frontend or backend tag and any other appropriate tags to this pull request

Description

This PR adds the automatic expiration mechanism for project history logs. It is similar to the access log mechanism. The expiration time span is configured through constance.

Notes

All changes are on the audit_log kobo app.

Testing

1. Change the title of an asset on Kobo
2. Open a shell on django

$ ./run.py -cf exec kpi bash 
$ ./manage.py shell_plus

3. Check that the change you just made is reflected in the last log metadata:

In [7]: ProjectHistoryLog.objects.last().metadata
Out[7]: 
{'name': {'new': 'Test test log', 'old': 'Test'},
 'source': 'Chrome (Linux)',
 'asset_uid': 'ae6hQt9s2phfjRnsNphLdA',
 'ip_address': '172.25.0.1',
 'log_subtype': 'project',
 'latest_version_uid': 'vi7x8mXHoWg7SVuW8sCnCS'}

3. On the Django admin screen, go to constance Config and set the value of PROJECT_HISTORY_LOG_LIFESPAN to 0
4. Execute the cleaning task:

In [8]: from kobo.apps.audit_log.tasks import spawn_logs_cleaning_tasks

In [9]: spawn_logs_cleaning_tasks()

5. Check that there are no project history logs:

In [11]: len(ProjectHistoryLog.objects.all())
Out[11]: 0

Related issues

Fixes Notion TASK-972

[notion-workspace]

Remove audit logs according to constance configuration

[rgraber]

Some questions

[magicznyleszek]

FE looks good :)

[rgraber]

LGTM