Add ecma_free_all_enqueued_jobs function (#2265)

This function releases any remaining promise job that wasn't completed.
Also added this function to `jerry_cleanup ()`, therefore it will be automatically run.

JerryScript-DCO-1.0-Signed-off-by: Daniel Balla dballa@inf.u-szeged.hu

jerry-core/ecma/operations/ecma-jobqueue.h

@@ -44,6 +44,7 @@ void ecma_job_queue_init (void);
 
 void ecma_enqueue_promise_reaction_job (ecma_value_t reaction, ecma_value_t argument);
 void ecma_enqueue_promise_resolve_thenable_job (ecma_value_t promise, ecma_value_t thenable, ecma_value_t then);
+void ecma_free_all_enqueued_jobs (void);
 
 ecma_value_t ecma_process_all_enqueued_jobs (void);