Re-enable RSpec/RepeatedExampleGroupDescription

[tramuntanal]

Describe the bug
PR #5785 disabled the RSpec/RepeatedExampleGroupDescription cop, but it is a good way to reduce duplicated code in rspec tests.

To enable this cop, we will require some dedication to extract common code in tests, but I think it is worth it to reduce the amount of rspec code.

To Reproduce
Steps to reproduce the behavior: N/A

Expected behavior
I would like to be advised when some tests contains repeated example groups, usually due to copy+pastes.

Screenshots
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Stacktrace
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Extra data (please complete the following information):
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Additional context
Add any other context about the problem here. For instance, add Metadecidim link.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. @carolromero & @andreslucena feel free to chime in.

[tramuntanal]

I find this cop interesting, don't close stale-bot!

[tramuntanal]

This is still pending stale-bot