Report telemetry events for rate limit errors (#16130)

clickhouse telemetry schema:

```
CREATE TABLE default.llm_rate_limit_events
(
    `time` DateTime64(3),
    `user_id` Int32,
    `is_staff` Bool,
    `plan` LowCardinality(String),
    `model` String,
    `provider` LowCardinality(String),
    `usage_measure` LowCardinality(String),
    `requests_this_minute` UInt64,
    `tokens_this_minute` UInt64,
    `tokens_this_day` UInt64,
    `max_requests_per_minute` UInt64,
    `max_tokens_per_minute` UInt64,
    `max_tokens_per_day` UInt64,
    `users_in_recent_minutes` UInt64,
    `users_in_recent_days` UInt64
)
ORDER BY tuple()
```

Release Notes:

- N/A

Co-authored-by: Marshall <marshall@zed.dev>