fix: resolve PSScriptAnalyzer warnings

Author: Aitomates

scripts/validate.ps1

@@ -50,5 +50,5 @@ finally {
     Pop-Location
 }
 
-Write-Host 'CAS platform validation passed.'
+Write-Output 'CAS platform validation passed.'
 

tests/Infrastructure.Tests.ps1

@@ -1,5 +1,8 @@
+[Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUseDeclaredVarsMoreThanAssignments', '')]
+param()
+
 BeforeAll {
-    $repoRoot = Split-Path -Parent $PSScriptRoot
+    $repoRoot = Split-Path -Parent -Path $PSScriptRoot
     $main = Get-Content -Raw (Join-Path $repoRoot 'infra/main.bicep')
     $compute = Get-Content -Raw (Join-Path $repoRoot 'infra/modules/container-apps.bicep')
     $observability = Get-Content -Raw (Join-Path $repoRoot 'infra/modules/observability.bicep')