Add PowerShell SAST job

Look at adding job using PSScriptAnalyzer for SAST checks. This is already used in the lint_powershell job. See:

• https://codewithvamp.medium.com/psscriptanalyzer-sast-tool-for-powershell-script-f2317e51e6e0
• https://devblogs.microsoft.com/powershell/powershell-injection-hunter-security-auditing-for-powershell-scripts/