Add prompt to help function use of less to instruct user how to quit
#7998
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PR Summary
Feedback is that new users don't know they are using
lessto page help content on non-Windows and it's not obvious how to quit. Thanks to @rkeithhill and @mklement0 we can add a custom prompt tolessgiving user help.Fix #7988
PR Checklist
.h,.cpp,.cs,.ps1and.psm1files have the correct copyright headerWIP:to the beginning of the title and remove the prefix when the PR is ready.[feature]if the change is significant or affects feature tests