Fix #2515: Include hidden folders in test discovery on Linux

Copilot-generated fix.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: nohwnd

src/Pester.RSpec.ps1

@@ -30,7 +30,8 @@
             foreach ($item in $items) {
                 if ($item.PSIsContainer) {
                     # this is an existing directory search it for tests file
-                    & $SafeCommands['Get-ChildItem'] -Recurse -Path $item -Filter "*$Extension" -File
+                    # use -Force to include hidden items (e.g. dot-prefixed folders on Linux)
+                    & $SafeCommands['Get-ChildItem'] -Recurse -Path $item -Filter "*$Extension" -File -Force
                 }
                 elseif ("FileSystem" -ne $item.PSProvider.Name) {
                     # item is not a directory and exists but is not a file so we are not interested
@@ -60,7 +61,8 @@
         else {
             # this is a path that does not exist so let's hope it is
             # a wildcarded path that will resolve to some files
-            & $SafeCommands['Get-ChildItem'] -Recurse -Path $p -Filter "*$Extension" -File
+            # use -Force to include hidden items (e.g. dot-prefixed folders on Linux)
+            & $SafeCommands['Get-ChildItem'] -Recurse -Path $p -Filter "*$Extension" -File -Force
         }
     }