Remove the `merge_request_dashboard_merge_checks` feature flag

Phil Hughesrequested to merge
ph/removeMergeRequestDashboardMergeChecksFeatureFlag into master

What does this MR do and why?

Removes the merge_request_dashboard_merge_checks feature flag so that we always fetch the merge checks on the merge request dashboard

References

#518710 (closed)

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Edited by Phil Hughes

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