Add tests/extras to gh actions workflows

[pchalasani]

Add another run in pytest.yml that installs the relevant extra deps and runs pytest tests/extras so that we don't neglect these tests.

[pchalasani]

In future, when we have tests that depend on optional/extra deps, we should keep the tests in tests/main and skip the test when the corresponding import fails, e.g. how I just did this in test_vector_stores.py where I skip chroma test. In the main pytest.yml workflow, we install the extras using poetry install -E "chromadb,transformers" (as an example) so that the extra deps get included and the tests are comprehensive, including extra deps.