chore: remove snapshot support (#4279)

* chore: remove snapshot support

This feature has had zero public usage and exposes protobuf 2.5 dependency in hbase 1.x.

Change-Id: Ie593a38a6fceca60e119360af25bdfc0a2a9fb11

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* oops

Change-Id: I91c2f430c2a53aa22b618c91a9c6aab0d778f6ff

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: igorbernstein2

bigtable-client-core-parent/bigtable-hbase-integration-tests-common/src/test/java/com/google/cloud/bigtable/hbase/AbstractTestSnapshot.java

@@ -39,7 +39,6 @@
   TestGet.class,
   TestGetTable.class,
   TestScan.class,
-  TestSnapshots.class,
   TestIncrement.class,
   TestListTables.class,
   TestPut.class,