<!--

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 -->


"jobName": "test-job-name",
    "parameters": {
        "inputSubscription": "test-subscription",
        "outputTable": "test-project:test-dataset.streaming_beam_sql",
    },
}
TEST_LOCATION = "custom-location"
TEST_REGION = "custom-region"
TEST_PROJECT = "test-project"
TEST_SQL_JOB_NAME = "test-sql-job-name"
TEST_DATASET = "test-dataset"
TEST_SQL_OPTIONS = {
    "bigquery-project": TEST_PROJECT,
    "bigquery-dataset": TEST_DATASET,
    "bigquery-table": "beam_output",
    "bigquery-write-disposition": "write-truncate",
}
TEST_SQL_QUERY = """
SELECT
    sales_region as sales_region,
    count(state_id) as count_state
FROM
    bigquery.table.test-project.beam_samples.beam_table
GROUP BY sales_region;
"""
TEST_SQL_JOB = {"id": "test-job-id"}
GCP_CONN_ID = "test_gcp_conn_id"
IMPERSONATION_CHAIN = ["impersonate", "this"]
CANCEL_TIMEOUT = 10 * 420
class TestDataflowCreatePythonJobOperator: