Sara Zan 2a840ee248
YAML versioning (#2209)
* Make YAML files get the same version as Haystack and throw warning at load in case of mismatch

* Update version of most YAMLs in the codebase (aesthethic chamge, only to avoid the warning).

* Remove quotes from version in tests

* Fix version in generate_json_schema.py

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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