[lworld] RFR: 8376105: [lworld] Handle "lworld" branch GHA dry-runs

[Chen Liang]

On Thu, 22 Jan 2026 16:33:24 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Noticed that [JDK-8343546](https://bugs.openjdk.org/browse/JDK-8343546) filter does not work well with "lworld": a full test run is still running when on "lworld" sync in personal fork happens. We just need to filter "lworld" as well.
> 
> Additional testing:
>  - [ ] GHA

Note that there are other branches like `type-classes`, `bworld`, `lworld+vector`, all of which have meaningful development content. I wonder if we should have a better way addressing the cache requirements.

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PR Comment: https://git.openjdk.org/valhalla/pull/1945#issuecomment-3786033364