refactor(stepfunctions): deprecate unused DISCARD variable and include JsonPath.DISCARD in docs

[kirkwat]

The DISCARD variable is removed because it unused. The docs are updated to be more clear to use JsonPath.DISCARD for CatchProps and ChoiceProps.

Closes #26760 .

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[lpizzinidev]

Thanks for the contribution!
I left you a comment regarding the deprecation.
Also, there is another DISCARD reference to update here.

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).