RFR: 1357: Add Oracle copyright header format check to jcheck

[David Holmes]

On Thu, 5 Dec 2024 23:26:30 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> The copyright year should only be updated if a "significant" change is made to the copyrighted material.

The copyright year is supposed to be always updated and we are not supposed to try to assess significance.

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PR Comment: https://git.openjdk.org/skara/pull/1702#issuecomment-2522202969