Migrate snekbox tests to Python 3.8's unittest

I've migrated the `tests/test_snekbox.py` file to use the new Python 3.8-style unittests instead of our old style using our custom Async mocks.

In particular, I had to make a few changes:

- Mocking the async post() context manager correctly

Since `ClientSession.post` returns an async context manager when called, we need to make sure to assign the return value to the __aenter__ method of whatever `post()` returns, not of `post` itself (i.e.. when it's not called).

- Use the new AsyncMock assert methods `assert_awaited_once` and `assert_awaited_once_with`

Objects of the new `unittest.mock.AsyncMock` class have special methods to assert what they were called with that also assert that specific coroutine object was awaited. This means we test two things in one: Whether or not it was called with the right arguments and whether or not the returned coroutine object was then awaited.

- Patch `functools.partial` as `partial` objects are compared by identity

When you create two partial functions of the same function, you'll end up with two different `partial` objects. Since `partial` objects are compared by identity, you can't compare a `partial` created in a test method to that created in the callable you're trying to test. They will always compare as `False`. Since we're not interested in actually creating `partial` objects, I've just patched `functools.partial` in the namespace of the module we're testing to make sure we can compare them.

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