v4.3.23 started Redis with the stored REDIS_PASSWORD value as it is and
unquoted, and the connection URLs used the same value. 4.4.0 resolved a
shared variable reference for the start command only, so after the first
restart the server password changed and no longer matched the URLs.
- Add legacy_password_quoting to standalone_redis; existing databases
keep the v4.3.23 server password
- New databases resolve REDIS_PASSWORD (local, shared or remote secret)
and quote it in the start command
- Connection URLs use the same password as the server
- Hide the flag in the API, as for KeyDB and Dragonfly
