[Tests] Replace pytest.main with tvm.testing.main

[Mousius]

This ensures that if you want to run a specific test script then at least it's reasonably consistent and as people copy test files they'll use the new function 😸

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[Mousius]

As promised @mehrdadh 😸 I'm fairly sure this is going to fail with some undefined tvm. Out of interest do we know why we don't encourage people running tests directly using the pytest CLI?

[junrushao]

LGTM!

[mehrdadh]

@Mousius I'm not sure what's the reason behind it. @driazati could help here.
Thanks for sending the fix!

[driazati]

I’ve always used pytest directly (and that’s what is tested in CI), I don’t think it really makes a huge difference but it’s nice to have the test files be directly runnable