replace applovin's deprecated getDisplayName() with getLabel() (FYI @grantkemp).
remove firestore's unused snippet delete_collection (internally removed in cl/182964490).
stop building the mlkit module: all the code in this module is deprecated, but it's still in this repo because it's shown as reference in firebase.google.com/docs/ml-kit (with a deprecation notice). Once these pages are deleted from the docs, we can remove the snippets from this repo.
A couple of things going on in this PR:
getDisplayName()withgetLabel()(FYI @grantkemp).delete_collection(internally removed in cl/182964490).mlkitmodule: all the code in this module is deprecated, but it's still in this repo because it's shown as reference in firebase.google.com/docs/ml-kit (with a deprecation notice). Once these pages are deleted from the docs, we can remove the snippets from this repo.