Create integration tests for v0.4 providers

[teocns]

IMPORTANT: Open a PR basing your branch off redesign to merge onto redesign

[Dwij1704]

Added instrumentation tests for the Anthropic, OpenAI and Haystack. These tests ensure that API calls are tracked and verified using spans. The tests utilize VCR to record API calls and cassettes for replaying them. Snapshots are used to verify the expected outputs.

[bboynton97]

stale and partially complete