test: use unique collection names

Author: bevzzz

src/it/java/io/weaviate/integration/CollectionsITest.java

@@ -195,7 +195,7 @@ public void testInvalidCollectionName() throws IOException {
 
   @Test
   public void testNestedProperties() throws IOException, Exception {
-    var nsBuildings = "Buildings";
+    var nsBuildings = ns("Buildings");
 
     client.collections.create(
         nsBuildings, c -> c.properties(

src/it/java/io/weaviate/integration/DataITest.java

@@ -481,7 +481,7 @@ record Address(
   @Test
   public void testNestedProperties_insertMany() throws IOException {
     // Arrange
-    var nsBuildings = "Buildings";
+    var nsBuildings = ns("Buildings");
 
     client.collections.create(
         nsBuildings, c -> c.properties(