Use pytests's freeze support to validate angr management builds

[twizmwazin]

Description

Pytest supports being frozen in applications and used to test functionality of frozen applications. This has the potential to be a significant upgrade to our current validation system. However, this does mean that we would need to include our tests in the frozen builds and provide them access to the binaries repo to run those tests. We probably would want to do the same for angr and other packages as well, which would require moving the tests into the sdist and wheels.

Relevant pytest docs: https://docs.pytest.org/en/7.1.x/example/simple.html#freezing-pytest

Alternatives

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Additional context

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