…ts input (#14267)

This is an automated backport of #13929 to the release-v6.0 branch. FYI
@aayush-kapoor
This backport has conflicts that need to be resolved manually.

### `git cherry-pick` output

```
Auto-merging packages/google/src/google-generative-ai-language-model.test.ts
Auto-merging packages/google/src/google-generative-ai-language-model.ts
CONFLICT (content): Merge conflict in packages/google/src/google-generative-ai-language-model.ts
Auto-merging packages/google/src/google-prepare-tools.ts
error: could not apply 5036db8... feat(google-vertex): add support for streaming tool arguments input (#13929)
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"
```

---------

Co-authored-by: Aayush Kapoor <83492835+aayush-kapoor@users.noreply.github.com>
Co-authored-by: Aayush Kapoor <aayushkapoor34@gmail.com>

… doGenerate (#14352)

## Background

#14314

introduced in #13929, we added support
for streaming tool call arguments for the vertex provider. but the check
for passing that parameter seeped through for doGenerate as well,
producing an API error (the generate endpoint rejects that option)

## Summary

- add a check to only pass `streamFunctionCallArguments` for doStream 

## Manual Verification

verified by running the example
`examples/ai-functions/src/generate-text/google/vertex-grounding.ts`
before and after the fix. before, it gave the api error. after: it
resolves and produces an answer

## Checklist

- [x] Tests have been added / updated (for bug fixes / features)
- [x] Documentation has been added / updated (for bug fixes / features)
- [x] A _patch_ changeset for relevant packages has been added (for bug
fixes / features - run `pnpm changeset` in the project root)
- [x] I have reviewed this pull request (self-review)

## Related Issues

fixes #14314