RuboCop TODO formatter: Retain all HAML exclusions

What does this MR do and why?

Previously, we only retained HAML exclusions which ended with html.haml.rb. We also need to retain exclusions with different format like text, atom, or no format (by mistake).

Follow-up of !123642 (merged).

Spotted during !115858 (comment 1441581996).

Contributes to #415330.

How to set up and validate locally

1. Merge !115858 (closed)
2. bundle exec rake rubocop:todo:generate[Style/RedundantInterpolation]
3. Entry app/views/notify/project_was_not_exported_email.text.haml.rb is now retained ✅

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