Add query parameters to GET /admin/v2/task-group/

[tcompa]

In GET /admin/v2/task-group/, we are adding two query parameters timestamp_last_used_min and timestamp_last_used_max (both are optional, and both are timezone-aware timestamps).

This will be available as of

• Make timestamp_last_used required and use it as filter in admin endpoint fractal-server#2061

[tcompa]

The updated endpoint is now part of fractal-server 2.9.0a5

[zonia3000]

[tcompa]

Great, thanks