Add support for enforcing symbolized shared examples #1747

Job	Run time
Confirm config and documentation	9s
Ruby 2.7: internal_investigation	23s
Ruby 2.7: spec	36s
Test coverage	19s
Edge RuboCop: internal_investigation	17s
Ruby 3.0: internal_investigation	15s
Edge RuboCop: spec	2m 5s
Ruby 3.0: spec	23s
RSpec 4	27s
Ruby 3.1: internal_investigation	11s
Ruby 3.1: spec	24s
Ruby 3.2: internal_investigation	20s
Ruby 3.2: spec	21s
Ruby ruby-head: internal_investigation	16s
Ruby ruby-head: spec	18s
Ruby jruby-9.4: internal_investigation	1m 20s
Ruby jruby-9.4: spec	1m 20s
	9m 24s

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