[Subtask] Unified user in the Hive Docker and ITs

[xunliu]

Describe the subtask

Currently, Hive container default user name is datastrato, We need change it to gravitino, At same time, we also modify a lot of code in the integration test code.

1. https://github.com/apache/gravitino/blob/main/dev/docker/hive/Dockerfile#L183-L192
2. https://github.com/apache/gravitino/blob/main/catalogs/catalog-hive/src/test/java/org/apache/gravitino/catalog/hive/integration/test/ProxyCatalogHiveIT.java#L75 (change datastrato to expect_user_name)
3. https://github.com/apache/gravitino/blob/main/catalogs/catalog-hive/src/test/java/org/apache/gravitino/catalog/hive/integration/test/ProxyCatalogHiveIT.java#L98 (change System.setProperty("user.name", "datastrato"); to System.setProperty("user.name", "test_user");)
4. https://github.com/apache/gravitino/blob/main/catalogs/catalog-hive/src/test/java/org/apache/gravitino/catalog/hive/integration/test/ProxyCatalogHiveIT.java#L151 (remove datastrato)
5. https://github.com/apache/gravitino/blob/main/catalogs/catalog-hive/src/test/java/org/apache/gravitino/catalog/hive/integration/test/ProxyCatalogHiveIT.java#L206 (remove datastrato)
6. https://github.com/apache/gravitino/blob/main/catalogs/catalog-hive/src/test/java/org/apache/gravitino/catalog/hive/integration/test/ProxyCatalogHiveIT.java#L312 (remove datastrato)

Parent issue

#5774

[unknowntpo]

@xunliu May I take this issue?