[containerapp] Fix datetime.date serialization error in az containerapp update --yaml

[Copilot]

az containerapp update --yaml raised 'datetime.date' object has no attribute '__dict__' when the YAML file contained bare date values (e.g. 2024-01-01). Python's YAML parser produces datetime.date objects for such values, but the default_handler in _object_to_dict only handled datetime.datetime.

Changes

• azext_containerapp/_utils.py: Added a local override of _object_to_dict whose default_handler catches both datetime.date and datetime.datetime, serializing them via .isoformat().
• containerapp_decorator.py, containerapp_job_decorator.py, containerapp_resiliency_decorator.py, daprcomponent_resiliency_decorator.py, custom.py: Switched _object_to_dict import from the core CLI module to the local extension ._utils.
• tests/latest/test_utils.py: Added unit tests covering datetime.date, datetime.datetime, and plain dict round-trip via _object_to_dict.

Related command

az containerapp 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? (azdev required; see .azure-pipelines/templates/azdev_setup.yml for the install command until azdev==0.2.11b1 is on PyPI)
• 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]

Validation for Breaking Change Starting...

Thanks for your contribution!

[azure-client-tools-bot-prd]

Hi Copilot,
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.

[Yong Zhang (yonzhan)]

containerapp