RFR: 8346046: Enable copyright header format check [v2]

[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.

Zhao Song has updated the pull request incrementally with one additional commit since the last revision:

  exclude more files

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/22721/files
  - new: https://git.openjdk.org/jdk/pull/22721/files/de49714d..62a26436

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22721&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22721&range=00-01

  Stats: 1 line in 1 file changed: 0 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