Get latency time series for a user

curl --request GET \
  --url https://example.com/api/admin/activity/users/{userId}/latency \
  --cookie better-auth.session_token=

[
  {
    "count": 123,
    "p50": 123,
    "p95": 123,
    "p99": 123,
    "t": "<string>"
  }
]