RFR: 2252: Backport command branch names not unique enough

[Erik Joelsson]

On Fri, 10 May 2024 18:33:03 GMT, Zhao Song <zsong at openjdk.org> wrote:

> To avoid the name clash of backport branch in the bot's fork, we could add `targetBranchName` to the backport branch name.

Marked as reviewed by erikj (Lead).

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PR Review: https://git.openjdk.org/skara/pull/1651#pullrequestreview-2050786268