Create migration for only max schema key of the same schema model

After starting to use lookupSchemasUntil in fetchSchemasWithSameModel, we are only getting
schemas until the given schema key for every schema key. Previously, we were getting all the
schemas for the same schema model.

This change caused change of behavior when a message contains multiple schema keys for same schema model.
When this happens, RDB Loader tries to create same table multiple times. In order to solve this problem,
this commit contains the change for creating the migration for only max schema key of the same schema model.

modules/loader/src/main/scala/com/snowplowanalytics/snowplow/rdbloader/db/Migration.scala

@@ -164,8 +164,11 @@ object Migration {
     target: Target[I],
     disableRecovery: List[SchemaCriterion]
   ): F[Migration[C]] = {
+    val nonAtomicTypes            = discovery.shreddedTypes.filterNot(_.isAtomic)
+    val maxSchemaKeysPerTableName = DataDiscovery.getMaxSchemaKeyPerTableName(nonAtomicTypes).values.toList
+    val filteredTypes             = nonAtomicTypes.filter(s => maxSchemaKeysPerTableName.contains(s.info.getSchemaKey))
     val descriptions: LoaderAction[F, List[Description]] =
-      discovery.shreddedTypes.filterNot(_.isAtomic).traverse {
+      filteredTypes.traverse {
         case s: ShreddedType.Tabular =>
           if (!disableRecovery.contains(s.info.toCriterion))
             EitherT.rightT[F, LoaderError](Description.Table(discovery.shredModels(s.info.getSchemaKey).mergeRedshiftSchemasResult))