Update feature_category for slow tests round 2

What does this MR do and why?

Describe in detail what your merge request does and why.

Update feature category for slow tests This information is added to rspec-profiling-stats reports and from here we can automatically quarantine tests and create issues for the related

Related #386443 (closed)

I'm using the folwing resources to determine the feature_ctegory:

• https://about.gitlab.com/categories.json
• https://gitlab.com/gitlab-com/www-gitlab-com/blob/master/data/stages.yml
• database documentation https://gitlab.com/gitlab-org/gitlab/-/tree/master/db/docs

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