Exclude importing keys in COUNTKEYSINSLOT/GETKEYSINSLOT #2726
Description
Although these commands are intended for "operator" usage, these are currently exposing in-progress slot migration keys and could be confusing. The main challenge is that atomic slot migration tests make use of COUNTKEYSINSLOT, however we could isolate this to a test-only functionality (e.g. DEBUG EXPOSE-IMPORTING-KEYS).
Ideally we could isolate this at the kvstore level so that it isn't something each code path needs to consider when accessing the kvstore