Validate REST script input before enqueueing jobs. Resolve ObjectVar
IDs to model instances and MultiObjectVar IDs to querysets, returning
HTTP 400 with errors nested under data when validation fails.
Share form preparation between the API and UI, including multi-value
defaults, while keeping validation out of the job runner to preserve
other execution paths. Exclude only known execution fields from script
data and prevent _notifications from leaking into CLI script input.
Document the REST compatibility changes, including required-field
validation and discarded undeclared keys. Add regression coverage for
object resolution, defaults, validation errors, and execution options.
Co-authored-by: Martin Burggraf <martin.burggraf@netclusive.com>
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