Applies a partial update. The required type discriminator must identify
the existing trigger kind. The supported types are schedule and
storage_object_created. Editing an inherited trigger creates a
child-local shadow with the same trigger_id; it remains disabled unless
this request explicitly enables it. For a schedule trigger, updating the
schedule or enabled state increments version and recomputes
next_run_at.
Disabling stops future scheduling but does not cancel occurrences already
committed for delivery. For storage_object_created, the configuration
selects one exact bucket. An omitted object-key prefix matches every key
in that bucket; a present prefix is matched byte-for-byte and
case-sensitively against the full key, without path normalization or a
path-segment boundary.
Note: This endpoint is currently in Beta.