[6.15.z] small fix related to repo sync bulk canceled scenario

[Satellite-QE]

Cherrypick of PR: #13951

Problem Statement

2 tests from foreman/api/test_repository.py were failing due to TyepError
Test cases name: test_positive_cancel_docker_repo_sync and test_positive_bulk_cancel_sync

TypeError: ForemanTask.poll() got an unexpected keyword argument 'canceled'

Solution

Poll() from ForemaTask of nailgun entities return status of task and the argument must_succeed would raised error if tasks finishes with other than success result, as we are cancelling sync so poll would raise error so passing False will resolve this error.

Related Issues

No

[Satellite-QE]

trigger: test-robottelo
pytest: tests/foreman/api/test_repository.py::TestRepositorySync::test_positive_bulk_cancel_sync tests/foreman/api/test_repository.py::TestDockerRepository::test_positive_cancel_docker_repo_sync