Reuse `FeatureCategories.available` for RuboCop

Lin Jen-Shinrequested to merge
reuse-available-feature-categories into master

What does this MR do and why?

Reuse FeatureCategories.available for RuboCop

There were a bit of duplicated work, and let's reuse as much as possible. This will help #379033 (comment 1261260350) as well.

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Edited by Lin Jen-Shin

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