unmute chunking test (#116123)

Author: maxhniebergall

muted-tests.yml

@@ -127,9 +127,6 @@ tests:
 - class: org.elasticsearch.xpack.inference.InferenceCrudIT
   method: testGet
   issue: https://github.com/elastic/elasticsearch/issues/114135
-- class: org.elasticsearch.xpack.inference.integration.ModelRegistryIT
-  method: testGetModel
-  issue: https://github.com/elastic/elasticsearch/issues/114657
 - class: org.elasticsearch.smoketest.DocsClientYamlTestSuiteIT
   method: test {yaml=reference/rest-api/usage/line_38}
   issue: https://github.com/elastic/elasticsearch/issues/113694