Change optionality of the `data` param in `submit` + `predict` (#8816)
* add initialiser to data
* tweak submit
* add changeset
* type fixes
* ruff lint
* fix test
* Revert "fix test"
This reverts commit 5d01b5c95bb19d3a189f98dc3c7df35d8720d414.
* Revert "ruff lint"
This reverts commit 2c8e518a750d25777b9d598c690d33ba394b4670.
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