feat(metrics)!: disable remote write proxy access logs by default

[swiatekm]

We've decided this is the better default, as the logs aren't useful for much other than debugging connectivity problems, and there's a fair amount of them.

This is an example of a rare breaking change that will happen without a major version bump. Users who want the old behaviour can just re-enable it in their configuration.

Checklist

• Changelog updated or skip changelog label added
• Documentation updated
• Template tests added for new features
• Integration tests added or modified for major features

[sumo-drosiek]

please fix markdownlint