Add Label Watcher

Adds a user as a watcher to a label. Choose the user by doing one of thefollowing:- Specify a user via a query parameter: Use the `accountId` to identify the user.- Do not specify a user: The currently logged-in user will be used.Note, you must add the `X-Atlassian-Token: no-check` header when making arequest, as this operation has XSRF protection.**[Permissions](https://confluence.atlassian.com/x/_AozKw) required**:'Confluence Administrator' global per...