{CI} Cancel serial release

[wangzelin007]

---

There can be at most one running and one pending job in a concurrency group at any time.

https://github.com/orgs/community/discussions/41518
https://github.com/orgs/community/discussions/12835
If extension A and extension B are released at the same time, B's pengding release workflow will be canceled because of extension A's automatically update index.json commit.

So we still keep concurrent release for CLI extensions.
But after each release, we will ensure that pull the latest index.json from main branch and overwrite the index.json in blob.(The last task in OneBranch extension release pipeline)

This checklist is used to make sure that common guidelines for a pull request are followed.

Related command

General Guidelines

• Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• Have you run python scripts/ci/test_index.py -q locally? (pip install wheel==0.30.0 required)
• My extension version conforms to the Extension version schema

For new extensions:

• My extension description/summary conforms to the Extension Summary Guidelines.

About Extension Publish

There is a pipeline to automatically build, upload and publish extension wheels.
Once your pull request is merged into main branch, a new pull request will be created to update src/index.json automatically.
You only need to update the version information in file setup.py and historical information in file HISTORY.rst in your PR but do not modify src/index.json.

[azure-client-tools-bot-prd]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd]

Hi @wangzelin007,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in setup.py as well.

[azure-client-tools-bot-prd]

Hi @wangzelin007,
Since the current milestone time is less than 7 days, this pr will be reviewed in the next milestone.

[yonzhan]

CI

[wangzelin007]

@bebound
Since it is too late and there are issues with the previous code, I will merge this PR first.
Please help review this PR when you are available.
You can check the code of pull the latest index.json from main branch and overwrite the index.json in blob.

[bebound]

LGTM