Fix edge function import error

Corrected an import error in the `run-cleanup-jobs` edge function. The function was attempting to import from a non-existent `../_shared/cors.ts` file. This has been resolved by defining the `corsHeaders` inline within the function, aligning with the pattern used in other edge functions.

supabase/functions/run-cleanup-jobs/index.ts

@@ -11,9 +11,13 @@
  */
 
 import { createClient } from 'https://esm.sh/@supabase/supabase-js@2.57.4';
-import { corsHeaders } from '../_shared/cors.ts';
 import { edgeLogger } from '../_shared/logger.ts';
 
+const corsHeaders = {
+  'Access-Control-Allow-Origin': '*',
+  'Access-Control-Allow-Headers': 'authorization, x-client-info, apikey, content-type',
+};
+
 interface CleanupResult {
   idempotency_keys?: {
     deleted: number;