Skip RWKV test in past CI
# What does this PR do?

In the past CI with torch 13.1 (and older), RWKV tests fail.

- The first failure is

  ```bash
  test_model_parallelism

  (line 114)  RuntimeError: CUDA error: CUBLAS_STATUS_EXECUTION_FAILED when calling cublasSgemm( handle, opa, opb, m, n, k,   &alpha, a, lda, b, ldb, &beta, c, ldc)
  ```
  - this affects 1x more subsequential tests
  - skip this particular test will reduce a lot the number of failures.

- The docker env. of that past CI uses a base docker image shipped with `cuda 11.6`

- **In a docker image with cuda `11.8` but installing `torch==1.13+cu116`, no failure.**

Let's not take too much time on identifying what exactly cause the failure here, and just skip RWKV tests on past CI with torch < 2.0.

The goal is just to have a clean past CI report.