Feature: Use "Distribution" certificate for iOS App AdHoc profiles

[priitlatt]

Continuation to the improvements first introduced in #185. There the default certificate type for iOS App distribution provisioning profiles was changed from iOS Distribution to Distribution so that single certificate could be used for provisioning profiles targeting different platforms.
Similar change can be also made for iOS App AdHoc profiles. Up until now iOS AdHoc profiles were mapped to iOS Distribution certificates, but those too can use the platform-independent Distribution certificates. So, with the changes here
provisioning profiles of type IOS_APP_ADHOC are assigned certificates with type DISTRIBUTION (as opposed to IOS_DISTIBUTION which was used before), when downloaded (or created) using action app-store-connect fetch-signing-files. This allows reusing one signing certificate for signing apps that target different platforms, and reduces need to create excess certificates in Apple Developer Portal.

Updated default provisioning profile type to certificate type is now as follows:

• IOS_APP_ADHOC provisioning profiles use DISTRIBUTION certificates by default (previously IOS_DISTRIBUTION).

The change is backwards compatible in the sense that existing matching IOS_DISTRIBUTION certificates are still used for iOS App AdHoc provisioning profiles in case they are found and no DISTRIBUTION certificates are present.

Updated actions:

• app-store-connect fetch-signing-files.