[Subtask] [Improvement] Trino Image: remove plugins does not shrink size

### Describe the subtask

Docker image is a overlay2 FS, if we remove a file, it only marks this file as delete, the size won't be reduced.

So we don't need to remove plugins in Dockerfile.

https://github.com/datastrato/gravitino/blob/0424c76b6afb2d41550d5a79ad0039b05bc1f3ef/dev/docker/trino/Dockerfile#L11-L47

### Parent issue

#2925

Open dev/docker/trino/Dockerfile and inspect lines 11-47 referenced by the issue. Identify the plugin-removal steps described there, then verify the Dockerfile remains valid and no longer performs those removals; completion means the Trino image definition builds without those steps.

Written by the indexing model from the issue text.