<!--

Welcome to Apache Airflow!  For a smooth issue process, try to answer the following questions.
Don't worry if they're not all applicable; just try to include what you can :-)

If you need to include code snippets or logs, please put them in fenced code
blocks.  If they're super-long, please use the details tag like
<details><summary>super-long log</summary> lots of stuff </details>

Please delete these comment blocks before submitting the issue.

-->

**Description**

Related to the discussion here: https://github.com/apache/airflow/pull/8553#discussion_r416136954

Allow user to define expected terminal state. e.g. `JOB_STATE_CANCELLED` could be not treated as failure but expected terminal state.


<!-- A short description of your feature -->


"""
    Helper enum for choosing what to do if job is already running.
    IgnoreJob - do not check if running
    FinishIfRunning - finish current dag run with no action
    WaitForRun - wait for job to finish and then continue with new job
    """
    IgnoreJob = 1
    FinishIfRunning = 2
    WaitForRun = 3
class DataflowConfiguration:
    """
    Dataflow configuration for BeamRunJavaPipelineOperator and BeamRunPythonPipelineOperator.
    .. seealso::