RFR: 8346046: Enable copyright header format check

[Zhao Song]

As requested in [SKARA-1357](https://bugs.openjdk.org/browse/SKARA-1357), now skara bot is able to check the copyright header format.
Now I am going to update the jcheck configuration to configure copyright check as an error.

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Commit messages:
 - udpate
 - 8346046

Changes: https://git.openjdk.org/jdk/pull/22721/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22721&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346046
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22721.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22721/head:pull/22721

PR: https://git.openjdk.org/jdk/pull/22721