Removed tri[lu]* tests, superseeded by OpInfos (#84256)
triu, tril, triu_indices and tril_indices had some
tests in test_tensor_creation_ops.py and test_cuda.py
that are redudant with the ones done by OpInfos for those ops.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/84256
Approved by: https://github.com/Lezcano, https://github.com/ngimel
