[Fix #9973] Fix a false positive for Layout/RescueEnsureAlignment

[koic]

Fixes #9973.

This PR fixes a false positive for Layout/RescueEnsureAlignment when aligned rescue keyword and leading dot.

---

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• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
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• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
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[bbatsov]

Looks good!

[casperisfine]

I think this change doesn't handle some case properly, after upgrading to 1.19

def some_method
  super do
    nil
  ensure
    nil
  end
end

An error occurred while Layout/RescueEnsureAlignment cop was inspecting xxx.rb:6:4.
undefined method `selector' for #<Parser::Source::Map::Keyword:0x00007ff5c1ba1cb0 @keyword=#<Parser::Source::Range xxx.rb 62...67>, @end=nil, @begin=nil, @expression=#<Parser::Source::Range xxx.rb 62...67>, @node=s(:zsuper)>
  ~/gems/rubocop-1.19.0/lib/rubocop/cop/layout/rescue_ensure_alignment.rb:140:in `aligned_with_line_break_method?'
  ~/gems/rubocop-1.19.0/lib/rubocop/cop/layout/rescue_ensure_alignment.rb:121:in `alignment_node'
  ~/gems/rubocop-1.19.0/lib/rubocop/cop/layout/rescue_ensure_alignment.rb:58:in `check'
  ~/gems/rubocop-1.19.0/lib/rubocop/cop/layout/rescue_ensure_alignment.rb:41:in `on_ensure'

[koic]

@casperisfine Thanks for your feedback. I will take it.