Finishing the deprecation of the skip_mode function in favor of
pytest.mark.skip_mode. This PR is only cleaning and migrating leftover tests
that are still used and old way of skip_mode.
Closesscylladb/scylladb#28299
Function skip_mode works only on function and only in cluster test. This if OK
when we need to skip one test, but it's not possible to use it with pytestmark
to automatically mark all tests in the file. The goal of this PR is to migrate
skip_mode to be dynamic pytest.mark that can be used as ordinary mark.
Closesscylladb/scylladb#27853
[avi: apply to test/cluster/test_tablets.py::test_table_creation_wakes_up_balancer]
extend and improve the tests of virtual tables for cdc with tablets.
split the existing virtual tables test to one test that validates the
virtual tables against the internal cdc tables, and triggering some
tablet splits in order to create entries in the cdc_streams_history
table, and add another test with basic validation of the virtual tables
when there are multiple cdc tables.
add a background fiber to the topology coordinator that runs
periodically and checks for old CDC streams for tablets keyspaces that
can be garbage collected.
Introduce basic tests creating CDC tables in tablets-enabled keyspaces,
verifying we can create and drop CDC tables, write and consume CDC log
entries, and consume the log while splitting streams.
