Layout/RescueEnsureAlignment continuation of #6254 #6771

[formigarafa]

This PR fix unexpected issues with Layout/RescueEnsureAlignment raised by #6771.
By implementing the solution for the related problems one pre-existing spec come to fail but I am not so sure if that has to pass as is or if that simply highlight the existence of two other possible conflicting layouts for rescue that were not being considered.

a_variable = begin
               something
             rescue
               log_some_failure
             end

a_variable = begin
  something
rescue
  log_some_failure
end

One of these 2 cases passes and the other fail after my changes but none of them fail before. I don't know if one of those styles should be selected over the other or if they should be considered equivalent and keep passing without error.

Before submitting the PR make sure the following are checked:

• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Added an entry to the Changelog if the new code introduces user-observable changes. See changelog entry format.
• The PR relates to only one subject with a clear title
  and description in grammatically correct, complete sentences.
• Run bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.

[formigarafa]

@Drenmi ,
Would I be correct to think that each of the styles I mentioned above would be defined by Layout/EndAlignment the same way as Layout/ElseAlignment does at https://github.com/rubocop-hq/rubocop/blob/master/lib/rubocop/cop/layout/else_alignment.rb#L109 ???

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