This reverts commitbcd1758911, reversing changes made tob2c2a99741. There is a design decision to not introduce additional test orchestration tool for scylladb.git (see comments for #27499). One commit has already been reverted in55c7bc7. Last CI runs made validator test flaky, so it is a time to remove all remaining validator tests. It needs a backport to 2026.1 to remove remaining validator tests from there. Fixes: VECTOR-497 Closes scylladb/scylladb#28568