fix: attempt to stringify request body before parsing (supabase#36586)

Author: laktek

apps/studio/components/interfaces/Functions/EdgeFunctionDetails/EdgeFunctionTesterSheet.tsx

@@ -159,7 +159,7 @@ export const EdgeFunctionTesterSheet = ({ visible, onClose }: EdgeFunctionTester
 
     // Validate that the body is valid JSON
     try {
-      JSON.parse(values.body)
+      JSON.parse(JSON.stringify(values.body))
     } catch (e) {
       form.setError('body', { message: 'Must be a valid JSON string' })
       return