feat: adds chat operations to foundry API

[baywet]

• ci: adds an agent definition for re-export of the openai api surface
• ci: updates the agent definition to handle imports in main
• feat: adds chat routes to the global foundry API surface
• ci: updates the template for re-export
• chore: refreshes the generated assets
• ci: adds undesired files to gitignore

[github-actions]

Next Steps to Merge

Important checks have failed. As of today they are not blocking this PR, but in near future they may.
Addressing the following failures is highly recommended:

• ⚠️ The check named Swagger BreakingChange has failed. To unblock this PR, follow the process at aka.ms/brch.

If you still want to proceed merging this PR without addressing the above failures, refer to step 4 in the PR workflow diagram.

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