The GitHub Actions job "Tests" on airflow.git has failed.
Run started by GitHub user ashb (triggered by ashb).

Head commit for run:
d0048414a6d3bdc282cc738af0185a9a1cd63ef8 / Mai Nakagawa <[email protected]>
Implement CronTriggerTimetable (#23662)

Relates #15432 

I also have gone through the above discussion and the related documents 
introduced there:
- [AIP-39 Richer 
scheduler_interval](https://cwiki.apache.org/confluence/display/AIRFLOW/AIP-39+Richer+scheduler_interval)
- [Scoping out a new feature for 2.1: improving 
schedule_interval](https://lists.apache.org/thread.html/rb4e004e68574e5fb77ee5b51f4fd5bfb4b3392d884c178bc767681bf%40%3Cdev.airflow.apache.org%3E)
- [[DISCUSS][AIP-39] Richer (and pluggable) schedule_interval on 
DAGs](https://lists.apache.org/thread.html/rf8eeb06493681f48dc9e82ce605a9c3a930cfee0b4ca19462a4e55b3%40%3Cdev.airflow.apache.org%3E)

The default behavior of 
[`CronDataIntervalTimetable`](https://github.com/apache/airflow/blob/2.2.5/airflow/timetables/interval.py#L116)
 is a little bit confusing - a DAG Run is triggered immediately after the DAG 
is enabled (unpaused), unlike normal cron's behavior.

Hence I'd like to add another cron timetable which does not care about "data 
interval" and which starts a DAG Run at the start of the period.

I know even without this PR, each Airflow user can [customize DAG scheduling 
with 
Timetables](https://airflow.apache.org/docs/apache-airflow/stable/howto/timetable.html#).
 However, I assume this PR worth adding to the main repository so that the 
users can use the timetable easier.

Report URL: https://github.com/apache/airflow/actions/runs/2786145196

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