`az managedapp create` command does not provide an option to control the identity

[jimdigriz]

Related command

az managedapp create ...

Is your feature request related to a problem? Please describe.
Similar to issue #21274, there is also no way to set the identity of the managed application to be deployed without manually preparing an ARM template.

Describe the solution you'd like
Deploying a managed application with only a SystemAssigned identity:

az managedapp create ... --identity-system

Deploying a managed application with only one or more UserAssigned identities:

az managedapp create ... --identity-user /subscription/... /subscription/....

Deploying a managed application with both system an user assigned identities:

az managedapp create ... --identity-system --identity-user /subscription/... /subscription/....

Describe alternatives you've considered
Using a regular ARM template with only the resource Microsoft.Solutions/applications:

az deployment group create ...

Additional context
Running version azure-cli 2.62.

[yonzhan]

Thank you for opening this issue, we will look into it.