chore: Add parameters to bin/test

[haacked]

And make sure we activate properly.

This doesn't affect any library code, just tooling around working on the project.

[greptile-apps]

PR Summary

Enhanced development scripts with virtual environment management and improved test execution flexibility in the PostHog Python library.

• Added ensure_virtual_env function in /bin/helpers/_utils.sh to centralize virtual environment activation checks
• Modified /bin/test to accept command-line arguments for pytest via "$@"
• Updated /bin/fmt to ensure virtual environment activation before running black and isort
• Added helpful error messages in /bin/helpers/_utils.sh when virtual environment setup is incomplete

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[haacked]

The real purpose of this PR is to fix the build. Looks like master is in a broken state.

[haacked]

Also updated test_openai.py, test_anthropic.py, and test_callbacks.py to be skipped when running locally via bin/test if the imports fail. They were failing the test runner and preventing me from running all the other tests.

Not sure if there's some setup code that should be added to bin/setup to run these tests locally, but for now, this fixes things for those developing locally.