application_snapshot() template doesn't use the kernel-service snapshot
application_snapshot() template doesn't use the kernel-service snapshot

This speeds up the Engine build by a few minutes on Windows since
other snapshots don't have to be gated on building the kernel-service
snapshot.

related https://github.com/flutter/flutter/issues/84787

Change-Id: I8e0e81b36e043364b1cbba4626fc33b9ad1de7ed
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/204920
Reviewed-by: Ryan Macnak <d738b7f001baf9789095d7dc549cff6de60b011d@google.com>
Commit-Queue: Zach Anderson <9f8b31e960a68dade71618f1ff6da6e23a1edfc9@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk