Changes to Clear message queue

query request parameter branch_id list-of-types was narrowed by removing types null

for the query request parameter branch_id, the type was generalized from no type to string

added the new optional query request parameter branch_id

added the new optional query request parameter keep_sent

added the new optional query request parameter keep_pr_watch

added the non-success response with the status 422

the endpoint scheme security PersonalAccessTokenAuth was added to the API

endpoint added