[ci] Adding the test-amd.yaml for test definitions for the AMD backend. (alternative PR) (vllm-project#26718)

Signed-off-by: Alexei V. Ivanov <alexei.ivanov@amd.com>
Signed-off-by: 0xrushi <6279035+0xrushi@users.noreply.github.com>

Author: Alexei-V-Ivanov-AMD