[Doc]: Several undocumented parameters for New-AzADApplication

### Type of issue

Could you kindly make sure all the parameters for this precious cmdlet are fully documented?

For example, `CreatedOnBehalfOfDeletedDateTime` and `DeletedDateTime` have an empty description.

Thank you!

### Feedback

### Page URL

https://learn.microsoft.com/en-us/powershell/module/az.resources/new-azadapplication?view=azps-14.0.0

### Content source URL

https://github.com/Azure/azure-powershell/blob/main/src/Resources/Resources/help/New-AzADApplication.md

### Author

@mikefrobbins

### Document Id

64473a6e-a6f6-dbc3-956c-0e42fcf138af

### Platform Id

77b2a63b-bc7e-a87f-ade4-7302e02c9748

Open src/Resources/Resources/help/New-AzADApplication.md and review the parameter documentation for New-AzADApplication, starting with CreatedOnBehalfOfDeletedDateTime and DeletedDateTime. Ensure every parameter has a useful description, then compare the page with the linked Microsoft Learn documentation to confirm the completed cmdlet reference is fully documented.

Written by the indexing model from the issue text.