GitHub Actions: integration test workflow

[sfraint]

• Add a new reusable workflow for artifact and cross-version integration tests
• Add a new triggered workflow that runs all these tests
• Refactor precommit workflow(s) to run the artifact tests via the new reusable workflow
• Add helper python scripts to query docker and pypi release tags

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To manually run the python helper scripts:

$ python get_docker_versions.py --image batfish/batfish --days=90 --minimum=3 --json-format --pattern=202
["2022.04.06.1263","2022.03.16.1242","2021.12.13.1143"]

$ python get_pypi_versions.py --package pybatfish --days=90 --minimum=3 --json-format
["2022.3.16.1242","2022.2.18.1216","2021.11.4.1095"]

[batfish-bot]

This change is