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

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