Google generators return answers instead of replies

[anakin87]

Generators in Google integrations return answers instead of replies in the output dictionary.

This makes it difficult to swap them with other Generators.
We should fix this inconsistency.

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1. The changes are merged in the main branch (Code + Docstrings)
2. The package has been released on PyPI
3. Docs at https://docs.haystack.deepset.ai/ were updated
4. Integration tile on https://github.com/deepset-ai/haystack-integrations was updated (in review)
5. Notebooks on https://github.com/deepset-ai/haystack-cookbook were updated (in review)
6. Tutorials on https://github.com/deepset-ai/haystack-tutorials were updated (if needed)
7. Articles on https://github.com/deepset-ai/haystack-home/tree/main/content were updated (in review)