ci: cancel duplicate workflow to reduce CI queue time

[Yiyiyimu]

Signed-off-by: yiyiyimu wosoyoung@gmail.com

What this PR does / why we need it:

We always wait for CI queue time, and we always trying to reduce waiting time. Here is another method to achieve it.

The method is that whenever a new commit added to PR, the previous running CI could be canceled since it is of no use. This could be achieved by using Github API, find the workflow on the same branch but with different SHA. And we could achieve this with potiuk/cancel-workflow-runs which is also used in Apache Airflow.

To bypass the limit of third party Actions, the recommendation provided by Apache Infra is to use submodules.

Since the "cancel" workflow could only be triggered after merged, so I could not test it in this PR. Thus I duplicate the same situation in my own repo, and it works as expect. See Yiyiyimu/GithubActionsTest#5 you could find previous running workflow got cancelled when a new one coming in. Also see https://github.com/Yiyiyimu/GithubActionsTest/runs/2344066993?check_suite_focus=true for cancellation detail.

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[Yiyiyimu]

Work as expect:
https://github.com/apache/apisix/actions/runs/754861826