Bug Report: vtctlclient -- UpdateThrottlerConfig only updates SrvKeyspace but not Keyspace

[shlomi-noach]

Overview of the Issue

Context: #12523 and #12520

The fix in #12520 applies to vtctldclient UpdateThrottlerConfig. However, vtctldclient and vtctlclient use different code paths at this time. The fix is missing on vtctlclient. As result, vtctlclient -- UpdateThrottlerConfig does not update Keyspace's ThrottlerConfig. Users of vtctlclient are therefore still susceptible to #12523

Reproduction Steps

$ vtctlclient -- UpdateThrottlerConfig --enable --threshold 1.111 commerce
$ vtctlclient -- GetKeyspace commerce
{
  "served_froms": [],
  "keyspace_type": 0,
  "base_keyspace": "",
  "snapshot_time": null,
  "durability_policy": "semi_sync",
  "throttler_config": null,
  "sidecar_db_name": "_vt"
}

Binary Version

v16

Operating System and Environment details

-

Log Fragments

No response