RFR: 2424: Enable copyright format check

[Zhao Song]

On Wed, 11 Dec 2024 20:09:18 GMT, Zhao Song <zsong at openjdk.org> wrote:

> Enable copyright check for skara

.jcheck/conf line 32:

> 30: [checks]
> 31: error=author,reviewers,whitespace
> 32: warning=copyright

I am not sure if we should make it an error or warning. Maybe warning first and later we can change it to error

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PR Review Comment: https://git.openjdk.org/skara/pull/1703#discussion_r1881004619