fix: Store $? and $LASTEXITCODE first in PowerShell (#3316)

These need to be stored before calling any PowerShell function or executable.
Otherwise the values will be overwritten and cannot be properly restored
or passed to starship.

Fixes: #3315

src/init/starship.ps1

@@ -63,6 +63,9 @@ function global:prompt {
         $process.StandardOutput.ReadToEnd();
     }
 
+    $origDollarQuestion = $global:?
+    $origLastExitCode = $global:LASTEXITCODE
+
     # Invoke precmd, if specified
     try {
         if (Test-Path function:Invoke-Starship-PreCommand) {
@@ -70,9 +73,6 @@ function global:prompt {
         }
     } catch {}
 
-    $origDollarQuestion = $global:?
-    $origLastExitCode = $global:LASTEXITCODE
-
     # @ makes sure the result is an array even if single or no values are returned
     $jobs = @(Get-Job | Where-Object { $_.State -eq 'Running' }).Count