Refactor app commands to use getAppRegistrationByAppName util

[martinlingstuyl]

Update the following commands to replace the duplicated code with the entraApp.getAppRegistrationByAppName util:

• entra app get
• entra app permission list
• entra app remove
• entra app role add
• entra app role list
• entra app role remove
• entra app set
• pp managementapp add (note: this one is a special case that needs additional attention)

Also, let's fix one that we missed before: update the following commands to replace the duplicated code with the entraApp.getAppRegistrationByAppId util:

• entra app permission add

[MartinM85]

I will take it