Password reset improvements

What does this MR do?

A customer was unable to successfully reset their root account password on a new self-managed Omnibus instance, and it ended up being resolved on a call with Support. (internal link)

• they were on 13.0, so the rake task failed with:

Don't know how to build task 'gitlab:password:reset' (See the list of available tasks with `rake --tasks`) 

• This was an assumption on my part, adding the release version to the docs helps with that.

• on the call, resetting the password via rails didn't work. It turns out reconfirmation was blocking the root account, which as it was still admin@example.com would be unfixable.

MAde this groupdistribution to match the 13.9 rake task addition

Related issues

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