Add support for enforcing symbolized shared examples #1723

Job	Run time
Test coverage	23s
Confirm config and documentation	8s
Edge RuboCop: internal_investigation	18s
Edge RuboCop: spec	27s
Ruby 2.7: internal_investigation	16s
RSpec 4	28s
Ruby 2.7: spec	15s
Ruby 3.0: internal_investigation	17s
Ruby 3.0: spec	21s
Ruby 3.1: internal_investigation	14s
Ruby 3.1: spec	27s
Ruby 3.2: internal_investigation	12s
Ruby 3.2: spec	25s
Ruby ruby-head: internal_investigation	14s
Ruby ruby-head: spec	1s
Ruby jruby-9.4: internal_investigation	15s
Ruby jruby-9.4: spec	13s
	4m 54s

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