Make EnableProtobufNegotiation configurable to enable native histogram scraping in static mode

[Reimirno]

PR Description

Add EnableProtobufNegotiation to static config so as to enable native histogram scraping in static mode.

scrape_classic_histograms is already supported so no action here.

Which issue(s) this PR fixes

Fixes #7056

Notes to the Reviewer

PR Checklist

• [ ] CHANGELOG.md updated
• [ ] Documentation added
• [ ] Tests updated
• [ ] Config converters updated

[CLAassistant]

All committers have signed the CLA.

[Reimirno]

Can I get some eyes on this PR?

cc: @bcotton @rafaelroquetto since git blame shows your names :)

[bcotton]

Perhaps the wrong Bob?

[github-actions[bot]]

This PR has not had any activity in the past 30 days, so the needs-attention label has been added to it. If you do not have enough time to follow up on this PR or you think it's no longer relevant, consider closing it. The needs-attention label signals to maintainers that something has fallen through the cracks. No action is needed by you; your PR will be kept open and you do not have to respond to this comment. The label will be removed the next time this job runs if there is new activity. Thank you for your contributions!

[ptodev]

Hi @Reimirno, apologies but I'll close the PR because we no longer add new features to static mode.