Use cached_get_entity_by

Summary

Replace Crawler._get_entity_by... by cached versions of pylib.

Please track on https://gitlab.indiscale.com/caosdb/customers/umg/management/-/issues/84

Test Environment

unit and int tests

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src/caoscrawler/crawl.py

@@ -37,6 +37,7 @@ import importlib
 import logging
 import os
 import sys
+from caosdb.exceptions import EmptyUniqueQueryError
 import uuid
 from caosdb.cached import cached_get_entity_by, cache_clear
 import warnings