[monorepo] add clsi-sharded mode (#34614)
* [monorepo] provide clsi-sharded dev-env setup
* [monorepo] provide sharded clsi-nginx when using clsi-sharded
* [clsi-perf] run on all instances again
* [monorepo] switch default TL to 2025.1 in clsi (same as web)
* [monorepo] avoid starting base clsi when running clsi-perf with clsi-sharded
* [clsi-lb] use 3s check interval in clsi-sharded mode
GitOrigin-RevId: 3cae8f0c1db69dbd76b94b45dc45b3abb2fa0a83
Jakob Ackermann