Use linux.24xlarge for conda linux nightly builds (#108695)
Fixes https://github.com/pytorch/pytorch/issues/108607
CI test: https://github.com/pytorch/pytorch/pull/108666
Lowering memory limit did not worked: https://github.com/pytorch/pytorch/pull/108669
Pull Request resolved: https://github.com/pytorch/pytorch/pull/108695
Approved by: https://github.com/drisspg, https://github.com/seemethere, https://github.com/huydhn
