update partition stat file extension

Author: danielhumanmod

quarkus/service/src/test/java/org/apache/polaris/service/quarkus/task/BatchFileCleanupTaskHandlerTest.java

@@ -129,7 +129,7 @@ public void close() {
           TaskTestUtils.writePartitionStatsFile(
               snapshot.snapshotId(),
               snapshot.sequenceNumber(),
-              "/metadata/" + UUID.randomUUID() + ".partition_stats",
+              "/metadata/" + UUID.randomUUID() + ".stats",
               fileIO);
       String firstMetadataFile = "v1-295495059.metadata.json";
       TableMetadata firstMetadata =
@@ -163,7 +163,7 @@ public void close() {
           TaskTestUtils.writePartitionStatsFile(
               snapshot2.snapshotId(),
               snapshot2.sequenceNumber(),
-              "/metadata/" + UUID.randomUUID() + ".partition_stats",
+              "/metadata/" + UUID.randomUUID() + ".stats",
               fileIO);
       String secondMetadataFile = "v1-295495060.metadata.json";
       TableMetadata secondMetadata =

quarkus/service/src/test/java/org/apache/polaris/service/quarkus/task/TableCleanupTaskHandlerTest.java

@@ -511,7 +511,7 @@ public void testTableCleanupMultipleMetadata() throws IOException {
         TaskTestUtils.writePartitionStatsFile(
             snapshot.snapshotId(),
             snapshot.sequenceNumber(),
-            "/metadata/" + UUID.randomUUID() + ".partition_stats",
+            "/metadata/" + UUID.randomUUID() + ".stats",
             fileIO);
     String firstMetadataFile = "v1-295495059.metadata.json";
     TableMetadata firstMetadata =
@@ -545,7 +545,7 @@ public void testTableCleanupMultipleMetadata() throws IOException {
         TaskTestUtils.writePartitionStatsFile(
             snapshot2.snapshotId(),
             snapshot2.sequenceNumber(),
-            "/metadata/" + UUID.randomUUID() + ".partition_stats",
+            "/metadata/" + UUID.randomUUID() + ".stats",
             fileIO);
     String secondMetadataFile = "v1-295495060.metadata.json";
     TaskTestUtils.writeTableMetadata(