feat: add allow document rejection setting - #3362

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.

Accepts allowDocumentRejection in the organisation and team settings
update routes, adds it to the default organisation (true) and team
(inherit) settings, and copies the merged value into the document meta
when a document or template is created via extractDerivedDocumentMeta.
Documents created from a template take the template's value, with an
optional override on envelope.use.

Exposes the field in the recipient signing response and refuses
rejectDocumentWithToken requests for documents that disallow rejection,
since the endpoint can be called directly without the UI.

Extends the document preferences and envelope settings e2e tests to
cover inheritance into the team settings and new documents, and
persistence of the per-document value from the editor.

Hides the reject dialog on the V2 signing page sidebar and mobile menu,
the embed V1 signing page and the multi-sign embed view when the
document's allowDocumentRejection is false. In embeds the reject option
is shown only when both the embed's allowDocumentRejection option and
the document setting allow it, and the embed V1 footer layout follows the
same condition. Exposes the field in the multi-sign document response so
the embed view can read it.

Documents the relationship between the embed's allowDocumentRejection
option and the document setting in the iframe and embedded editor docs,
and in the API description of the field.

Part of #2561