Add new `Capybara/FindAllFirst` cop #280

Job	Run time
Confirm config and documentation	9s
Test coverage	10s
Edge RuboCop: internal_investigation	15s
Edge RuboCop: spec	11s
Prism	28s
Ruby 2.7: internal_investigation	21s
RSpec 4	12s
Ruby 2.7: spec	23s
Ruby 3.0: internal_investigation	9s
Ruby 3.0: spec	10s
Ruby 3.1: internal_investigation	10s
Ruby 3.1: spec	10s
Ruby 3.2: internal_investigation	9s
Ruby 3.2: spec	11s
Ruby 3.3: internal_investigation	9s
Ruby 3.3: spec	10s
Ruby ruby-head: internal_investigation	11s
Ruby ruby-head: spec	10s
Ruby jruby-9.4: internal_investigation	53s
Ruby jruby-9.4: spec	54s
	5m 35s

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