Adds an allowDocumentRejection column to organisation settings (default
true), team settings (nullable, inherits from the organisation) and
document meta (default true), with the migration.
Adds the "Allow Document Rejection" field to the organisation and team
document preferences form, wires it through the settings pages, and lists
it in the reset-to-defaults dialog and the admin settings section. Adds a
per-document Yes/No field to the envelope editor settings dialog.
Exposes the field on the document meta create/update schemas and the
document, envelope, template and editor envelope response schemas, and
hides the reject dialog on the V1 signing page when the document
disallows rejection.