[Backport 8.16] Fix most ML APIs (#3290)

* updated discovery node class

* correct import

* fixes around ml

* more ml fixes, tentative discoverynode fix

* more ml fixes

* even more ml fixes

* other ml fixes

* modeling discovery node

* correct discovery nodes optionals

* correcting types

* removed deprecated params

* Update specification/ml/_types/TrainedModel.ts

Co-authored-by: Quentin Pradet <[email protected]>

* Update specification/ml/_types/TrainedModel.ts

Co-authored-by: Quentin Pradet <[email protected]>

* Update specification/ml/_types/TrainedModel.ts

Co-authored-by: Quentin Pradet <[email protected]>

* Update specification/ml/_types/TrainedModel.ts

Co-authored-by: Quentin Pradet <[email protected]>

* Update specification/ml/_types/TrainedModel.ts

Co-authored-by: Quentin Pradet <[email protected]>

* addressing reviews

* Update specification/ml/_types/inference.ts

Co-authored-by: Quentin Pradet <[email protected]>

* Update specification/ml/_types/inference.ts

Co-authored-by: Quentin Pradet <[email protected]>

* Update specification/ml/_types/inference.ts

Co-authored-by: Quentin Pradet <[email protected]>

* Update specification/ml/post_data/MlPostJobDataResponse.ts

Co-authored-by: Quentin Pradet <[email protected]>

* more review addressing

* merge fixes

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Co-authored-by: Quentin Pradet <[email protected]>
(cherry picked from commit ea3e9b6)

Co-authored-by: Laura Trotta <[email protected]>