Obsolete `StringAsInstanceDoubleConstant` in favor of `VerifiedDoubleReference` for constants only #2401

Job	Run time
Confirm config and documentation	16s
Test coverage	24s
Edge RuboCop: internal_investigation	18s
Edge RuboCop: spec	27s
Ruby 2.7: internal_investigation	34s
Oldest RuboCop: spec	26s
Ruby 2.7: spec	39s
Prism	59s
Ruby 3.0: internal_investigation	17s
RSpec 4	20s
Ruby 3.0: spec	21s
Ruby 3.1: internal_investigation	26s
Ruby 3.1: spec	30s
Ruby 3.2: internal_investigation	19s
Ruby 3.2: spec	36s
Ruby 3.3: internal_investigation	19s
Ruby 3.3: spec	26s
Ruby ruby-head: internal_investigation	15s
Ruby ruby-head: spec	18s
Ruby jruby-9.4: internal_investigation	1m 33s
Ruby jruby-9.4: spec	1m 22s
	11m 5s

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