Add v3 client libraries reference for InfluxDB 3 Cloud

Cloud pages don't exist yet at the paths below, so [`content/influxdb3/cloud/request-information.md`](https://github.com/influxdata/docs-v2/blob/master/content/influxdb3/cloud/request-information.md) aliases them to a "Request more information" page. Publish the real content and remove the alias.

Closest existing equivalent to source from: `/influxdb3/enterprise/reference/client-libraries/v3/`

## Aliased paths

- [ ] `/influxdb3/cloud/reference/client-libraries/v3/`

## Done when

- [ ] Content is published (or the linking shared content is gated for Cloud)
- [ ] The alias is removed from `request-information.md`
- [ ] Any hidden anchor ``s that belonged to these paths are removed
- [ ] `link-checker` passes

Part of #7391.

Start with content/influxdb3/cloud/request-information.md and compare the closest existing content under /influxdb3/enterprise/reference/client-libraries/v3/. Publish the Cloud reference at /influxdb3/cloud/reference/client-libraries/v3/, or gate shared content for Cloud, then remove the alias and any hidden anchor spans belonging to it. Run link-checker to confirm the documentation is complete.

Written by the indexing model from the issue text.