Obsolete `StringAsInstanceDoubleConstant` in favor of `VerifiedDoubleReference` for constants only #2445

Job	Run time
Confirm config and documentation	9s
Test coverage	18s
Edge RuboCop: internal_investigation	13s
Edge RuboCop: spec	24s
Oldest RuboCop: spec	20s
Prism	32s
Ruby 2.7: internal_investigation	22s
RSpec 4	18s
Ruby 2.7: spec	21s
Ruby 3.0: internal_investigation	11s
Ruby 3.0: spec	21s
Ruby 3.1: internal_investigation	15s
Ruby 3.1: spec	16s
Ruby 3.2: internal_investigation	15s
Ruby 3.2: spec	22s
Ruby 3.3: internal_investigation	15s
Ruby 3.3: spec	20s
Ruby 3.4: internal_investigation	6s
Ruby 3.4: spec	5s
Ruby ruby-head: internal_investigation	1s
Ruby ruby-head: spec	1s
Ruby jruby-9.4: internal_investigation	4s
Ruby jruby-9.4: spec	2s
	5m 31s

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