Refactor expect tests on test_higher_order_ops.py. (#110290)
This PR inlines the expecteds strings onto the `assertExpectedInline` calls, so that, when
change is needed, we may do that by using the `expectedtest` machinery: setting the
environment variable `EXPECTTEST_ACCEPT=1`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/110290
Approved by: https://github.com/zou3519
