Under the preview features menu in Azure Repos is a flag for "Git commit menu extension points". There's no documentation for what target id should be used for how one can create contributions that target this menu.
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Thanks for your feedback, @debben. I've created a user story on my backlog to address this!
While we work on documenting this, here are the extension points that exist when that preview feature is turned on:
"ms.vss-code-web.git-commit-list-menu" is for the "..." menu on the commit listing page:

"ms.vss-code-web.git-commit-details-menu" is for the "..." menu on the commit detail page:

Hi @debben, I've updated the article, which should go live on 07/23. Thanks again for your valuable feedback!
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While we work on documenting this, here are the extension points that exist when that preview feature is turned on:
"ms.vss-code-web.git-commit-list-menu" is for the "..." menu on the commit listing page:
"ms.vss-code-web.git-commit-details-menu" is for the "..." menu on the commit detail page: