[bazel] skia_app_container: Tag *all* targets as manual.
[bazel] skia_app_container: Tag *all* targets as manual.

See doc linked in bug for context.

Bug: skia:12672
Change-Id: I9ef832deac831535308b8458d00fdae10ca32f9a
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/474041
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot