Move FeatureSpecMaxExamples cop from GitLab here

Eduardo Sanz Garcíarequested to merge
eduardosanz/add-FeatureSpecMaxExamples-cop into master

What does this MR do and why?

FeatureSpecMaxExamples prevents spec files to grow beyond 25 examples.

Reference: gitlab-org/gitlab!233270 (merged)

Edited by Eduardo Sanz García

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