Improve warning when additional PowerShell isn't found #5099
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Since we added logic which searches for possible intended permutations of the given additional PowerShell path, we needed to make the warning show only if none of the permutations were found. This was accomplished by suppressing it in the first iterator and then yielding it again after the permutations were exhausted with the warning unsuppressed.
@JustinGrote this bug just really annoyed me...I'm surprised no one reported it yet.