Changes to List checkpoints

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

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

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

for the query request parameter limit, the type changed from no type to integer

for the query request parameter skip, the type changed from no type to integer

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

the endpoint scheme security PersonalAccessTokenAuth was added to the API

added the optional property items/build_error to the response with the 200 status