Merge branch 'ee-1159-allow-permission-check-bypass-in-approve-access-request-service' into 'master'

Allow Members::ApproveAccessRequestService to accept a new `:force` option

## What does this MR do?

See the commit message.

This is a backport of the EE fix for https://gitlab.com/gitlab-org/gitlab-ee/issues/1159: gitlab-org/gitlab-ee!830

See merge request !7168