Address query limit override in specs for Mergerequests

In MR !155732 (merged), we added validation for presence of Organizations.

As a consequence, logic that is checking organization membership is issuing additional queries. This broke specs that are counting the number of queries. One of those specs is spec/requests/api/graphql/project/merge_requests_spec.rb

The additional queries are executed because we call https://gitlab.com/gitlab-org/gitlab/-/blob/53a78bd4393764a6b2fca42da73addf5b96cd5a6/app/models/group.rb#L732 this

The number of queries for the test should be lowered to under 200 The exception for the rate limit should be lowered as well (or even removed)