Allow forcing delete without filter

[itepifanio]

Is your feature request related to a problem? Please describe. I was trying to migrate from elastic to loki, but a problem occur during this time and I had to delete to start over.

The problem is that Loki only have two delete modes: filter-only and filter-and-delete. After removing the data the filter is kept active and I can't remove this filter since it can't cancel processed delete requests.

Describe the solution you'd like

Loki should allow cancel the filter of processed deletion requests when force=true is available at the endpoint.

[itepifanio]

@slim-bean pinging you since we quickly discussed this feature. I think it will make data migration more straightforward.