fix: wrap Where-Object pipelines in @() to prevent scalar collapse on single result

Co-authored-by: Copilot <copilot@github.com>

Author: sandeepjha000

src/powershell/private/tests-shared/Get-ApplicationsWithInsufficientOwners.ps1

@@ -22,7 +22,7 @@ function Get-ApplicationsWithInsufficientOwners {
     $allApps = Get-ApplicationsWithPermissions -Database $Database -ExcludeServicePrincipalType 'ManagedIdentity'
 
     # Filter by privilege level and owner count
-    $filteredApps = $allApps | Where-Object {($PrivilegeLevel -contains $_.Risk) -and ($_.OwnerCount -lt 2)}
+    $filteredApps = @($allApps | Where-Object {($PrivilegeLevel -contains $_.Risk) -and ($_.OwnerCount -lt 2)})
 
     Write-PSFMessage "Filtered to $($filteredApps.Count) applications with < 2 owners matching privilege levels: $($PrivilegeLevel -join ', ')" -Level Verbose
 

src/powershell/private/tests-shared/Get-ApplicationsWithPermissions.ps1

@@ -57,7 +57,7 @@ order by spsi.lastSignInActivity.lastSignInDateTime
 
     # Exclude specified service principal types before enrichment to avoid unnecessary per-item DB calls
     if ($ExcludeServicePrincipalType) {
-        $results = $results | Where-Object { $ExcludeServicePrincipalType -notcontains $_.servicePrincipalType }
+        $results = @($results | Where-Object { $ExcludeServicePrincipalType -notcontains $_.servicePrincipalType })
         Write-PSFMessage "Excluded $($ExcludeServicePrincipalType -join ', ') type(s), $($results.Count) service principals remaining" -Level Verbose
     }