build-commit-from: Add support for--end-of-life-rebase=OLD=NEW

This lets you rebase an app, as well as other matching refs (OLD is
used as a prefix match) such as locale and debug extensions.

r your changes. Lines starting

Closes: #2775
Approved by: alexlarsson
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f