Add mariadb service option to containerapp ext

[ahmelsayed]

---

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?

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

⚠️containerapp

rule	cmd_name	rule_message	suggest_message
⚠️ 1011 - SubgroupAdd	containerapp service mariadb	sub group containerapp service mariadb added

[azure-client-tools-bot-prd]

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

[azure-client-tools-bot-prd]

Hi @ahmelsayed,
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.

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

[anandanthony]

If this would require a new version to be released, can we update the History.rst file with the changes.

[zhoxing-ms]

Please take a look at this comment #6550 (comment)

[ahmelsayed]

Please take a look at this comment #6550 (comment)

Done