dev.knotless.setTriager

Names the account among the triagers of the repository's dev.knotless.repo record, for the scopes given, in place of what it had, as `knotless triager add` does: its labels of those scopes count, below the owner's and collaborators'. Its owner can, logged in to this appview's web pages: the appview writes with the session it keeps for that account, which the pages' session cookie names. For an organization's repository, so can an admin who joined it, logged in to the pages or with a service token from their own PDS for this method: the appview's gateway, which the organization delegated its writes to, writes as the organization.