PowershellArgumentNeedsEscaping does not account for a single quoted string

[JustinGrote]

PowerShellEditorServices/src/PowerShellEditorServices/Utility/StringEscaping.cs

Lines 17 to 33 in 8c568bc

	public static bool PowerShellArgumentNeedsEscaping(string argument)
	{
	foreach (char c in argument)
	{
	switch (c)
	{
	case '\'':
	case '"':
	case '|':
	case '&':
	case ';':
	case ':':
	case char w when char.IsWhiteSpace(w):
	return true;
	}
	}

Will match true on 'test string', it should match false. The ' case needs an additional check to make sure the argument isn't already enclosed in quotes.

[JustinGrote]

@rjmholt
https://github.com/JustinGrote/PowerShellEditorServices/blob/b27021d30c1a1badff8f6a9e2c34b95de33cc647/src/PowerShellEditorServices/Utility/StringEscaping.cs#L13

Shouldn't this be `', not ''?