[ML] Unmute fixed Classification IT tests #122359

Unmute tests following #122268

Closes #120071
Closes #121236

Author: valeriy42

muted-tests.yml

@@ -263,9 +263,6 @@ tests:
 - class: org.elasticsearch.xpack.security.FileSettingsRoleMappingsRestartIT
   method: testFileSettingsReprocessedOnRestartWithoutVersionChange
   issue: https://github.com/elastic/elasticsearch/issues/120964
-- class: org.elasticsearch.xpack.ml.integration.ClassificationIT
-  method: testWithOnlyTrainingRowsAndTrainingPercentIsFifty_DependentVariableIsKeyword
-  issue: https://github.com/elastic/elasticsearch/issues/120071
 - class: org.elasticsearch.xpack.security.profile.ProfileIntegTests
   method: testGetUsersWithProfileUidWhenProfileIndexDoesNotExists
   issue: https://github.com/elastic/elasticsearch/issues/121179
@@ -274,9 +271,6 @@ tests:
 - class: org.elasticsearch.xpack.security.profile.ProfileIntegTests
   method: testSetEnabled
   issue: https://github.com/elastic/elasticsearch/issues/121183
-- class: org.elasticsearch.xpack.ml.integration.ClassificationIT
-  method: testWithDatastreams
-  issue: https://github.com/elastic/elasticsearch/issues/121236
 - class: org.elasticsearch.xpack.test.rest.XPackRestIT
   method: test {p0=transform/*}
   issue: https://github.com/elastic/elasticsearch/issues/120816