feat: add ExpiryIndicatorClassic functionality with configuration and rendering

- Implemented ExpiryIndicatorClassic.js for managing expiry dates in SharePoint lists.
- Created classic-elements.xml to define the module for ExpiryIndicator assets.
- Added upgrade-actions-v2.xml to apply the new element manifests.
- Introduced ExpiryModels.test.ts for unit testing the expiry configuration and rules validation.

scripts/Disable-ExpiryIndicator.ps1

@@ -22,8 +22,10 @@ $context.Credentials = [System.Net.CredentialCache]::DefaultNetworkCredentials
 try {
     $list = $context.Web.Lists.GetByTitle($ListTitle)
     $field = $list.Fields.GetByInternalNameOrTitle($ExpiryFieldInternalName)
+    $customActions = $list.UserCustomActions
     $context.Load($list)
     $context.Load($field)
+    $context.Load($customActions)
     $context.ExecuteQuery()
 
     if ($field.ClientSideComponentId -ne $FieldCustomizerComponentId) {
@@ -34,8 +36,16 @@ try {
         $field.ClientSideComponentId = [Guid]::Empty
         $field.ClientSideComponentProperties = ''
         $field.Update()
+
+        $customActions | Where-Object {
+            $_.Name -eq 'ExpiryIndicator.Classic.ScriptLink' -or
+            $_.Name -eq 'ExpiryIndicator.Classic.Ribbon'
+        } | ForEach-Object {
+            $_.DeleteObject()
+        }
+
         $context.ExecuteQuery()
-        Write-Host 'ExpiryIndicator-Verknüpfung wurde entfernt. Feld und Daten bleiben unverändert.'
+        Write-Host 'ExpiryIndicator-Verknüpfung und Classic-Registrierungen wurden entfernt. Feld und Daten bleiben unverändert.'
     }
 }
 finally {