Update the details, license, and channel assignments for an existing customer.
Supports changing metadata, license type, expiration, entitlements, and feature flags.
Parameters that are not provided are reset to default values, except for
type, is_enterprise_portal_enabled, is_dev_mode_enabled, and saml_allowed, which
preserve their currently stored value instead of resetting it when omitted.
is_embedded_cluster_multinode_enabled is also preserved when omitted, but
only while is_embedded_cluster_download_enabled is true; otherwise it is
reset like any other omitted parameter.
Changing type away from "dev" while a customer has dev mode enabled requires
explicitly sending is_dev_mode_enabled=false in the same request; otherwise
the preserved stored dev-mode value conflicts with the new type and the
request is rejected with a 400.

Required RBAC Policy: kots/app/[:appid]/license/[:licenseid]/update