[WIP] Testing OpenAI Agents SDK Examples

[donald-pinckney]

What was changed

Adding testing of the OpenAI Agents SDK sample workflows.

Why?

Should test our Agents SDK samples to ensure they remain functional / correct.

Checklist

• Test locally that the test runs correctly (awaiting API key...)
• Test all the other Agents SDK workflows.
• Update README with instructions for setting API key in the testing section.
• Do we have API key to use in CI?

1. Closes [Feature Request] End-to-end testing for OpenAI Agents SDK examples #254

2. How was this tested:
   Not yet tested - will test.

3. Any docs updates needed?
   Tracked in checklist.