RFC: add pipeline_selection to @pipeline_failure_sensor

Summary:
allow users to specify a list of pipeline names that they want to alert on

besides, make_slack_on_pipeline_failure_sensor takes text_fn and blocks_fn and follow the same fallback as stated in slack's doc - this is so users who want fancy slack msg can use the built in without rewriting the same logic: e.g. D8700

my_slack_on_failure_sensor = make_slack_on_pipeline_failure_sensor(
    channel="#alert",
    slack_token=os.environ["SLACK_TOKEN"],
    blocks_fn=lambda context: slack_message_blocks_fn(context, base_url),
    pipeline_selection=[
        "download_pipeline",
    ],
)

Test Plan: the one in toy pipeline only alerts on error_monster

Reviewers: owen, prha, sandyryza

Reviewed By: prha

Differential Revision: https://dagster.phacility.com/D8701