[Container App] 'az containerapp create --yaml' always shows warning about additional arguments.

### Describe the bug

The warning is always triggered:

https://github.com/Azure/azure-cli-extensions/blob/e71b50428904aee5c6affc4708c71619ecf8a61c/src/containerapp/azext_containerapp/containerapp_decorator.py#L809

Because the `self.get_argument_revisions_mode()` is specified as a default argument as "single" see: https://github.com/Azure/azure-cli-extensions/blob/e71b50428904aee5c6affc4708c71619ecf8a61c/src/containerapp/azext_containerapp/custom.py#L405

### Related command

`az containerapp create -g rg-container-app1 -n myapp --yaml myapp.yaml`

### Errors

Warning: `Additional flags were passed along with --yaml. These flags will be ignored, and the configuration defined in the yaml will be used instead`

### Issue script & Debug output

no need

### Expected behavior

Everything specified in yaml, should not raise a warning when creating/updating a containerapp with minimal cli arguments.

### Environment Summary

azure-cli 2.57.0

### Additional context

_No response_