Allow passing deps in py_pytest_main

[linzhp]

Type of change

• New feature or functionality (change which adds functionality)

py_pytest_main generates a py_library that depends on pytest without declaring it as the dependency. This PR adds a deps attribute to py_pytest_main, and pass it down to the py_library, because:

1. it's more "correct" to have a py_library declaring its own dependency instead of having its consumer to do that job
2. Gazelle would remove @pypi_pytest//:pkg from the py_test target that depends on py_pytest_main, because the py_test target doesn't import pytest.

Test plan

• Covered by existing test cases

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[mattem]

Thanks!