RFR: 8320358: GHA: ignore jdk* branches

[Magnus Ihse Bursie]

On Tue, 21 Nov 2023 16:02:16 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> I note that this would be easy to fix by changing the bot to use backport-USERNAME-SHORTHASH instead of the current where USERNAME is first.

It also have the benefit of being more logical. :-)

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PR Comment: https://git.openjdk.org/jdk/pull/16763#issuecomment-1821215456