GPU test flake (hermetic CUDA): `test_inplace_mul_scalar_different_dtype`

[ysiraichi]

🐛 Bug

The test test_inplace_mul_scalar_different_dtype (at test_operations.py) looks flaky, specifically in #8665. It's possible to see this test passing and failing.

• Passing: https://github.com/pytorch/xla/actions/runs/14710978384
• Failing: https://github.com/pytorch/xla/actions/runs/14712995117/job/41291911098