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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integrationtests/test_issues.py

@@ -30,6 +30,11 @@ from caosdb.utils.register_tests import clear_database, set_test_key
 set_test_key("10b128cf8a1372f30aa3697466bb55e76974e0c16a599bb44ace88f19c8f61e2")
 
 
+@pytest.fixture
+def clear_cache(autouse=True):
+    cache_clear()
+
+
 def test_issue_23(clear_database):
     """Test that an update leaves existing properties, that were not found by
     the crawler, unchanged.