Disable core dumping on ROCm UT workflows (#100532)
Recently an issue was observed on PyTorch CI in which the ROCm nodes were running out of space due to out of control core dumping.
https://github.com/pytorch/pytorch/issues/99578
To mitigate this issue we have proposed to disable core dumping on the ROCm workers with the `--ulimit core=0` flag in the docker run command in `_rocm-test.yml`
https://stackoverflow.com/questions/58704192/how-to-disable-core-file-dumps-in-docker-container/59611557#59611557
Before this change
```
ulimit -a
core file size (blocks, -c) unlimited
```
After this change
```
ulimit -a
core file size (blocks, -c) 0
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/100532
Approved by: https://github.com/jeffdaily, https://github.com/jithunnair-amd, https://github.com/malfet
