Remove grace period for Gitlab/ServiceResponse

In Deprecate `http_status` in ServiceResponse object (!97557 - merged) we deprecated the use of ServiceResponse#http_status and added a Rubocop 👮 to detect usages.

The 👮 was added with a grace period Details: grace period. We should remove the grace period after 1-2 weeks from merging Deprecate `http_status` in ServiceResponse object (!97557 - merged)

By design, #f_rubocop should be notified if we see silenced offenses during a grace period. Once we no longer see these notifications we can safely remove the grace period.

I don't have numbers yet but I think having the grace period turned on for a week or two should be sufficient.