Fix DeepSpeed CI
# What does this PR do?

Since 2 days, the daily CI runs with torch 2.0.0. In DeepSpeed CI job, there is an issue regarding `torch-tensorrt` (currently `v1.3.0`).
The installation was already disabled in #22135, but there was a version shipped with the base image, and I forgot to uninstall it in our docker image during building.

Remark: The failure is our `undefined symbo` friend
```python
E   ImportError: /opt/conda/lib/python3.8/site-packages/torch_tensorrt/lib/libtorchtrt.so: undefined symbol: _ZN2at11show_configB5cxx11Ev
```
_The documentation is not available anymore as the PR was closed or merged._<|||||>ouch, i checked it took tensor-rt 1 month to release a version supporting pt-1.13 after the latter was released. 

so I won't expect any coming updates quickly.

do we need tensor-rt for anything?

Thank you for fixing this, @ydshieh! Glad to have you on top of things as always!<|||||>Hi @stas00 It's probably my bad.

In #20758, it (the one shipped with the base image) was uninstalled (same reason as this PR) 
In #20758 (next day), I found a way to install it - and just updated the docker file without thinking if we need it.

A quick search gives me
```python
def is_torch_tensorrt_fx_available():
    if importlib.util.find_spec("torch_tensorrt") is None:
        return False
    return importlib.util.find_spec("torch_tensorrt.fx") is not None
```
But I think it's irrelevant to DeepSpeed CI job.

**I can actually remove these 2 lines**
```bash
# This installation instruction will uninstall torch 2.0.0
# TODO: uncomment and update the following line once `torch-tensorrt` is ready for `torch 2.0.0`
```
~~**if you are also OK with this.**~~

Well, let's remove the installation line, as it was never there originally - it was just shipped with the base image 

(BTW, thank you for checking the release time of  `torch-tensorrt` ❤️ )