Backport: chore(azure) add built-in tools tests for azure provider Responses API

[vercel-ai-sdk]

This is an automated backport of #9431 to the release-v5.0 branch.
This backport has conflicts that need to be resolved manually.

git cherry-pick output

Auto-merging packages/azure/src/azure-openai-provider.test.ts
CONFLICT (content): Merge conflict in packages/azure/src/azure-openai-provider.test.ts
error: could not apply f1eed1c94... chore(azure) add built-in tools tests for azure provider Responses API (#9431)
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
hint: Disable this message with "git config set advice.mergeConflict false"