After 2.13.0 release: action needed on Chat Generators

[anakin87]

In #1623, we are making our Chat Generators compatible with the new deserialize_tools_or_toolset_inplace.

After Haystack 2.13.0 release, we should:

• remove the import fallback workaround introduced in chore: update ChatGenerators with deserialize_tools_or_toolset_inplace #1623
• add Toolset to init and run methods of all Chat Generator integrations. Follow pattern in OpenAIChatGenerator
• release a new version of each Chat Generator

[julian-risch]

We need to check run method signature of Mistral