(maint) Update powershell helpers to escape correctly for linux

This commit updates the PuppetBolt powershell module to correctly escape hash
parameters for linux platforms. Conversation in this thread:
MicrosoftDocs/PowerShell-Docs#2361 describe the
circumstances of why interpolation breaks.

The fix is to include backslash escape chars for all quotes in hash parameters
if the powershell function is running on linux

pwsh_module/pwsh_bolt_internal.ps1

@@ -42,7 +42,19 @@ function Get-BoltCommandline {
       Write-Verbose "Parsing $($kvp.key) as hashtable parameter"
       $v = ConvertTo-Json -InputObject $pwshValue -Compress
       $params += "--$($rubyParameter)"
-      $params += "'$($v)'"
+      # Commands run on Linux platforms will fail because the
+      # the interpolation of the command from powershell -> .NET -> Ruby
+      # will end up stripping out quotes that aren't baskslash-escaped.
+      #
+      # See https://github.com/MicrosoftDocs/PowerShell-Docs/issues/2361
+      #
+      # $IsLinux is an automatic variable from powershellcore:
+      # https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_automatic_variables?view=powershell-7.1#islinux
+      if ($IsLinux) {
+        $params += $v -replace '"', '\"'
+      } else {
+        $params += "'$($v)'"
+      }
     }
     elseif ($pwshValue.GetType().Name -eq 'List`1') {
       Write-Verbose "Parsing $($kvp.key) as array parameter"