User mentions can only be of people #59
Description
To be consistent with the Notion application, only users of type "people" can be mentioned in rich text objects or in people properties of databases. Trying to include users of type "bot" will return a validation error. Existing mentions of bot users is unaffected.
Notion API changelog reference: https://developers.notion.com/changelog/user-mentions-can-only-be-of-people
We may not need to add validation in the fetch database object but when we are going to add support for the create database then we may need to consider adding the validation on the models we use to create database. #56