The populate_views() and generate_and_propagate_view_updates() both naturally belong to view_update_generator -- they don't need anything special from table itself, but rather depend on some internals of the v.u.generator itself.
Moving them there lets removing the view concurrency semaphore from keyspace and table, thus reducing the cross-components dependencies.
Closesscylladb/scylladb#18421
* github.com:scylladb/scylladb:
replica: Do not carry view concurrency semaphore pointer around
view: Get concurrency semaphore via database, not table
view_update_generator: Mark mutate_MV() private
view: Move view_update_generator methods' code
view: Move table::generate_and_propagate_view_updates into view code
view: Move table::populate_views() into view_update_generator class
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