Fix help function to check if less is available before using
#11737
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PR Summary
The
helpfunction assumes on non-Windows thatlessis available as a pager. However, on some Linux systems,lessis not installed by default so usinghelpfails thatlessis not found. FIx is to check iflessis available before using and, if not, just output the help text instead of paging.PR Context
Fix #9830
PR Checklist
.h,.cpp,.cs,.ps1and.psm1files have the correct copyright headerWIP:or[ WIP ]to the beginning of the title (theWIPbot will keep its status check atPendingwhile the prefix is present) and remove the prefix when the PR is ready.