use correct ENV vars in Dockerfile

All version 3.x Dockerfile define ENV variables `INFLUXDB3_DATA_DIR` and `INFLUXDB_IOX_DB_DIR` however these don't exist.

Instead `INFLUXDB3_DB_DIR` and `INFLUXDB3_OBJECT_STORE` should be defined.

See: https://github.com/influxdata/influxdb/pull/26461

Inspect the version 3.x Dockerfiles and review their ENV declarations against the variable names listed in the issue. Update the obsolete names to the requested database and object-store variables, then verify that the Dockerfiles build successfully.

Written by the indexing model from the issue text.