feat(crons): Add deletion apis for processing errors

[wedamija]

This adds apis at both the monitor and project level for deleting checkin processing errors.

[wedamija]

If we want, we could just make this api per project as well, instead of having two separate ones

[evanpurkhiser]

If we want, we could just make this api per project as well, instead of having two separate ones

could add a query parameter to filter to monitor slug?

[wedamija]

If we want, we could just make this api per project as well, instead of having two separate ones

could add a query parameter to filter to monitor slug?

I can delete it without the monitor slug anyway. We only really have to delete the actually error, we don't have to delete from the index since it'll just drop any errors that don't have values. But I think I can also just get the monitor info from the stored processing error. Maybe it's better to just do that?