tests: Remove .py.exp files that match with CPython 3.8.2 or newer.

Running the tests now requires CPython 3.8.2 or newer, which was
released February 2020 and should be widely available.

A few examples of features that were previously not supported by CPython,
but which are now:
- %-formatting for bytes and bytearray (PEP 461), CPython 3.5
- annotated variables (PEP 526), CPython 3.6
- assignment expressions (PEP 572), CPython 3.8

Note that `basics/fun_code_full.py.exp` is added here because that requires
CPython 3.10 or newer.

Signed-off-by: Damien George <damien@micropython.org>

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