fix: correct "Remove from *arr" button (#1544)

This PR fixes the "Delete from *arr" button in the request list. It checks from the API whether the
*arr server corresponding to the request still exists before displaying the remove button, and fixes
a cache removal issue that could cause problems when deleting recently added media. This PR also
reverts #1476, which introduced problems during removal.

fix #1494

server/api/externalapi.ts

@@ -289,7 +289,7 @@ class ExternalAPI {
     return data;
   }
 
-  protected removeCache(endpoint: string, options?: Record<string, string>) {
+  protected removeCache(endpoint: string, options?: Record<string, unknown>) {
     const cacheKey = this.serializeCacheKey(endpoint, {
       ...this.params,
       ...options,