Remove log when pulldown_cmark produces long substituted text (#28375)

Turns out that consecutive dashes are substituted with half the number
of input dashes. Extended the test with this case as well

Release Notes:

- N/A
58731e2fd1Michael Sloan committed on 4/8/2025, 11:45:49 PM· committed by GitHubparentd0632a5
1 file changedLine totals unavailable