containerapp: fix create or update containerapp --yaml exposedPort

[Greedygre]

---

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

Related command

az containerapp env update
az containerapp create/update --yaml

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.
The precondition is to put your code inside this repository and upgrade the version in the pull request but do not modify src/index.json.

[azure-client-tools-bot-prd]

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

[yonzhan]

containerapp

[zhoxing-ms]

Please write the description of this PR change into HISTORY.rst. And if you want to release a new extension version for this PR, please also upgrade the version defined in the setup.py.

[Greedygre]

@zhoxing-ms
Hi, this PR has been reviewed by hong and zunli, and it needs to be merged before #6081
please help to review and merge, thanks!