refactor(proto): improve buf usage

[julienrbrt]

Description

Follow-up of #19536. Extracted in #19536 only the fixes to make proto-gen.
This PR further continues implementing the tasks from #19503

Closes: #19503

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[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[tac0turtle]

Let's reopen when there is time to focus on this

[julienrbrt]

Sure!

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[julienrbrt]

Still needed, I'll reopen a week before rc

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.