[fix]Fixed getChildren('/') on Oxia based provider (apache#24863)

(cherry picked from commit 4ec4c8b)

Author: merlimat

pulsar-metadata/src/main/java/org/apache/pulsar/metadata/impl/oxia/OxiaMetadataStore.java

@@ -149,7 +149,7 @@ Stat convertStat(String path, Version version) {
 
     @Override
     public CompletableFuture<List<String>> getChildrenFromStore(String path) {
-        var pathWithSlash = path + "/";
+        var pathWithSlash = path.endsWith("/") ? path : path + "/";
 
         return client
                 .list(pathWithSlash, pathWithSlash + "/")

pulsar-metadata/src/test/java/org/apache/pulsar/metadata/MetadataStoreTest.java

@@ -667,27 +667,15 @@ public void testGetChildren(String provider, Supplier<String> urlSupplier) throw
         store.put("/a/a-2", "value1".getBytes(StandardCharsets.UTF_8), Optional.empty()).join();
         store.put("/b/c/b/1", "value1".getBytes(StandardCharsets.UTF_8), Optional.empty()).join();
 
-        List<String> subPaths = store.getChildren("/").get();
-        Set<String> ignoredRootPaths = Set.of("zookeeper");
-        Set<String> expectedSet = Set.of("a", "b");
-        for (String subPath : subPaths) {
-            if (ignoredRootPaths.contains(subPath)) {
-                continue;
-            }
-            assertThat(expectedSet).contains(subPath);
-        }
+        List<String> subPaths = new ArrayList<>(store.getChildren("/").get());
+        subPaths.remove("zookeeper"); // ignored
+        assertThat(subPaths).containsExactlyInAnyOrderElementsOf(Set.of("a", "b"));
 
         List<String> subPaths2 = store.getChildren("/a").get();
-        Set<String> expectedSet2 = Set.of("a-1", "a-2");
-        for (String subPath : subPaths2) {
-            assertThat(expectedSet2).contains(subPath);
-        }
+        assertThat(subPaths2).containsExactlyInAnyOrderElementsOf(Set.of("a-1", "a-2"));
 
         List<String> subPaths3 = store.getChildren("/b").get();
-        Set<String> expectedSet3 = Set.of("c");
-        for (String subPath : subPaths3) {
-            assertThat(expectedSet3).contains(subPath);
-        }
+        assertThat(subPaths3).containsExactlyInAnyOrderElementsOf(Set.of("c"));
     }
 
     @Test(dataProvider = "impl")