[8.x][ML] Unmute fixed Classification IT tests (#122364)

Unmute tests following #122268

Closes #116564

Author: valeriy42

muted-tests.yml

@@ -373,9 +373,6 @@ tests:
 - class: org.elasticsearch.oldrepos.OldRepositoryAccessIT
   method: testOldSourceOnlyRepoAccess
   issue: https://github.com/elastic/elasticsearch/issues/120080
-- class: org.elasticsearch.xpack.ml.integration.ClassificationHousePricingIT
-  method: testFeatureImportanceValues
-  issue: https://github.com/elastic/elasticsearch/issues/116564
 - class: org.elasticsearch.xpack.esql.ccq.MultiClusterSpecIT
   method: test {date_nanos.Bucket Date nanos by 10 minutes}
   issue: https://github.com/elastic/elasticsearch/issues/120162