[rocm7.1] remove conda install

[pramenku]

Remove conda install since it's giving error: SWDEV-558675

[2025-10-03T03:57:40.466Z]   50 | >>> RUN bash ./install_conda.sh && rm install_conda.sh common_utils.sh /opt/conda/requirements-ci.txt
[2025-10-03T03:57:40.466Z]   51 |     
[2025-10-03T03:57:40.466Z]   52 |     # (optional) Install protobuf for ONNX
[2025-10-03T03:57:40.466Z] --------------------
[2025-10-03T03:57:40.466Z] ERROR: failed to solve: process "/bin/sh -c bash ./install_conda.sh && rm install_conda.sh common_utils.sh /opt/conda/requirements-ci.txt" did not complete successfully: exit code: 1

Validation http://rocm-ci.amd.com/job/mainline-pytorch2.7-manylinux-wheels/478/