test/boost: view_build_test: add test test_view_update_generator_deadlock
test/boost: view_build_test: add test test_view_update_generator_deadlock

A test case which reproduces the view update generator hang, where the
staging reader consumes all resources and leaves none for the pre-image
reader which blocks on the semaphore indefinitely.

scylladb/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla