[8.x][ML] Report deprecation for outdated snapshots (#118939)

This PR fixes the constant used to produce deprecated warnings in the Upgrade Assistant in 8.18. It ensures that for all ML model snapshots produced prior to version 8.3 the user can either delete or update them.

I marked it as a non-issue since it fixes the logic updated in #118166 and has not been released yet.

Author: valeriy42

x-pack/plugin/deprecation/src/main/java/org/elasticsearch/xpack/deprecation/MlDeprecationChecker.java

@@ -26,7 +26,6 @@
 import java.util.Map;
 import java.util.Optional;
 
-import static org.elasticsearch.xpack.core.ml.MachineLearningField.MIN_CHECKED_SUPPORTED_SNAPSHOT_VERSION;
 import static org.elasticsearch.xpack.core.ml.MachineLearningField.MIN_REPORTED_SUPPORTED_SNAPSHOT_VERSION;
 
 public class MlDeprecationChecker implements DeprecationChecker {
@@ -69,7 +68,7 @@ static Optional<DeprecationIssue> checkDataFeedAggregations(DatafeedConfig dataf
     }
 
     static Optional<DeprecationIssue> checkModelSnapshot(ModelSnapshot modelSnapshot) {
-        if (modelSnapshot.getMinVersion().before(MIN_CHECKED_SUPPORTED_SNAPSHOT_VERSION)) {
+        if (modelSnapshot.getMinVersion().before(MIN_REPORTED_SUPPORTED_SNAPSHOT_VERSION)) {
             StringBuilder details = new StringBuilder(
                 String.format(
                     Locale.ROOT,