Make dynamic JSON from cwvtech.report

### Details

https://github.com/Automattic/wp-calypso/pull/90457/ introduced and https://github.com/Automattic/wp-calypso/pull/90966 modified a JSON with data extracted from https://cwvtech.report/

In the future (probably when we decide that the feature is a success, converting more users), we want to make this data dynamic.

### Checklist

- [ ] Data that is currently static (downloaded from https://cwvtech.report) is not dynamic.

### Related

_No response_

Start by reading PRs 90457 and 90966 and inspect the JSON data extracted from cwvtech.report. Determine how that currently static data should be sourced dynamically; done means the data is no longer downloaded and embedded statically.

Written by the indexing model from the issue text.