mypy: add more ignored modules to `pyproject.toml` (#38769)

`mypy` will check *all* imported packages, even optional dependencies outside your
project, and this can cause issues if you are targeting python versions *older* than the
one you're running in. `mypy` will report issues in the latest versions of dependencies
as errors even if installing on some older python would have installed an older version
of the dependency.

We saw this problem before with `numpy` in #34732. We've started seeing it with IPython
in #38704. This fixes the issue by exempting `IPython` and a number of other imports of
Spack's from `mypy` checking.

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