CI failure, VADD on Windows #3072

Found during #3071

Needs attention; skipping for now

VADD is failing on CI exclusively on Windows host running docker on CI

Error: -ERR invalid vector specification

investigated:

• added unit tests with toy-server to validate the command being issued is correct and matches redis-cli monitor: fine
• changed FP32 suppression to rule out race conditions and CPU oddness: fine
• tested with multiple docker images: fine
• tested with linux host + docker locally: fine
• tested with Windows host + docker locally: fine
• checked server code for any smoking guns: nothing