Update pester tests

PS-GiteaUtilities/PS-GiteaUtilities.psm1

@@ -434,8 +434,8 @@ Function Invoke-GiteaFileDownload {
             return [PSCustomObject]@{
                 SourceURL = $downloadURL
                 Type = $type
-                Result = 'Success'
-                Error = "Skipped - item is a directory"
+                Result = 'Skipped'
+                Error = $null
                 Timestamp = Get-Date
                 FileSize = $null
             }
@@ -521,7 +521,7 @@ Function Invoke-GiteaFileDownload {
             Path = $fileOutputPath
             SourceURL = $downloadURL
             Type = "file"
-            Result = 'Failure'
+            Result = $null
             Error = $null
             Timestamp = Get-Date
             FileSize = $null
@@ -545,6 +545,7 @@ Function Invoke-GiteaFileDownload {
                 }
             }
             else {
+                $result.Result = 'Skipped'
                 $errorMsg = "The file '$fileOutputPath' already exists. Use the -Force switch to overwrite the file."
                 Write-Error $errorMsg
                 $result.Error = $errorMsg
@@ -578,6 +579,7 @@ Function Invoke-GiteaFileDownload {
             return $result
         }
         catch {
+            $result.Result = 'Failure'
             $errorMsg = "Failed to download file from Gitea: $_"
             Write-Error $errorMsg
             $result.Error = $errorMsg