[jdk25u] RFR: 8371094: --mac-signing-key-user-name no longer works

[duke]

On Fri, 7 Nov 2025 22:20:53 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

> Almost clean backport of https://github.com/openjdk/jdk/pull/28120 PR with trivial conflict resolution.

@alexeysemenyukoracle 
Your change (at version 1bf0978e332de820e86bf8664f421058d2c20892) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk25u/pull/366#issuecomment-3542358562