command to know in which release branch(es) a specific commit is

[targos]

I don't think we have a simple automated way to do that now. Due to the way we land commits in releases, we cannot just search for the commit SHA in release branches.
I think it would be useful to have a command for that.

Prior art in V8: https://github.com/v8/v8/blob/master/tools/release/mergeinfo.py

[targos]

Example:

PR: nodejs/node#30123
Landed on master in nodejs/node@511f67b
Landed on v13.x in nodejs/node@d549a34
Landed on v12.x in nodejs/node@375f349
Did not land on v10.x or v8.x

[github-actions]

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