[Improvement] Change `HADOOP_USER_NAME` for all containers from `datastrato` or `anonymous` to `gravitino`

### What would you like to be improved?

We need to unify the value `HADOOP_USER_NAME` in all containers as the current value `datastrato` and `anonymous` is not so suitable now.

### How should we improve?

_No response_

Search the repository's container definitions for HADOOP_USER_NAME and identify every occurrence of datastrato or anonymous. Update the container configuration so the value is gravitino everywhere, then verify that no container definitions retain the old values.

Written by the indexing model from the issue text.