type CollectionProperties: Record<CollectionId, SerializedFields>;Per-collection property snapshot keyed by collection id. Each value is the serialized property bag for
that collection. Used by data connector handlers (e.g. for query collection detection — a collection is
a query collection iff its properties include a non-empty QueryCollectionQueryString value).
Property keys mirror those defined in cake/app/webroot/ts/property/collection/collectionproperties.ts.