Updates a collection of AdHoc Groups with new data.
Returns the updated groups or validation errors.

Mandatory Fields (each record):

• Id - required on PATCH to identify which AdHoc Group to update

Required Fields:

• cartId (route) - required
• untypedRecords (body) - must not be null or empty

Behavior

• Requires the EnableCartAdhocGroups feature to be enabled; returns 500 with a localized message when disabled.
• The body must be a non-empty array; each record's Id must reference an AdHoc Group that exists in the cart.
• Updatable fields include Name, Sequence, ChargeType, Category, Configuration, Description, Frequency, and GroupType.
• Returns only the groups that were matched and updated.