Fix problem with runas failing to execute powershell scripts

[rocklan]

What does this PR do?

Fixes the problem when specifying runas when running a powershell script.

The issue was that the code that trying to escape characters by calling win_functions.escape_argument. However that function is for escaping characters for the cmd shell, and in this case we are using powershell to execute a script, and so powershell needs to know how to run the script. This is solved by prefixing the string with a &, and surrounding it in quotes.

What issues does this PR fix or reference?

Fixes: #61166

Previous Behavior

The output would appear something like this:

^C:\ProgramData\Salt Project\Salt\var\cache\salt\minion\tmpg02cql8w\__salt.tmp.j_yi8_ho.ps1^ : The term
                  '^C:\ProgramData\Salt Project\Salt\var\cache\salt\minion\tmpg02cql8w\__salt.tmp.j_yi8_ho.ps1^' is not recognized as
                  the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was

New Behavior

Script runs.

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[rocklan]

I'm going to close this PR because I've found out it breaks other things (installing chocolatey via salt). In the short term I have a workaround, you can just set the cachedir parameter on the minion to a directory that doesn't have any spaces, and then the character escaping doesn't run, and things work ok.