Fixes https://github.com/spring-projects/spring-integration/issues/3041 Some Redis clients/servers don't allow to perform an `INFO` command, therefore we are not able to determine if we can perform `UNLINK` or not. * Deprecate `RedisUtils.isUnlinkAvailable()` as not reliable source of through; use trial with fallback algorithm in the target logic around `UNLINK` command calls. **Cherry-pick to 5.1.x**