When generating view updates for base mutations when no pre-existing
data exists, we were forgetting to apply the tracked tombstones.
Fixes #4321
Tests: unit(dev)
* https://github.com/duarten/scylla materialized-views/4321/v1.1:
db/view: Apply tracked tombstones for new updates
tests/view_schema_test: Add reproducer for #4321
(cherry picked from commit 2b8bf0dbf8)