Add snowplow_mobile_delete_from_manifest macro

[emielver]

Describe the feature

We already have the snowplow_web_delete_from_manifest macro in snowplow_delete_from_manifest. We should make the equivalent macro for the snowplow-mobile package to make the API less cumbersome for the user

Describe alternatives you've considered

We can alternatively call the more generic snowplow_delete_from_manifest function with two arguments as follows:
{{ snowplow_utils.snowplow_delete_from_manifest(var('models_to_remove', []), ref('snowplow_mobile_incremental_manifest')) }}
however this is more cumbersome

Who will this benefit?

This will benefit all future users of the snowplow-mobile package that is currently in development