[validation-errors] Fixes in watcher API (#1889) (#1891)

* Adding cancelled properties as optional since is hides behind a `include_cancelled` param.

* Add UDF as a possible value for FieldValue

* changing input into a singlekey dictionnary to capture nesting

* Fixing compare & array_compare conditions

* Add codegen name for udf

* Fix inversion during refactoring

* Add refreshed schema & types

* Prettifying code

* Rename udf in favor of any

* Remove unused imports

* Update schema

Co-authored-by: Laurent Saint-Félix <[email protected]>

Author: github-actions[bot]