Fixes to user discovery package

e2e/ratchet/partner/session/testUtils.go

go.mod

storage/clientVersion/store_test.go

storage/session.go

storage/user/cryptographic_test.go

storage/user/registation_test.go

storage/user/user_test.go

storage/user/username_test.go

storage/utility/blockStore_test.go

storage/utility/bucketParams_test.go

storage/utility/dh_test.go

storage/utility/group_test.go

storage/utility/messageBuffer_test.go

storage/utility/multiStateVector_test.go

storage/utility/sidh_test.go

storage/utility/stateVector_test.go

storage/versioned/kv.go

storage/versioned/kv_test.go

ud/addFact_test.go

ud/confirmFact_test.go