RFR: 8313312: Add missing classpath exception copyright header

[Maurizio Cimadamore]

On Fri, 28 Jul 2023 13:02:20 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

> Adds `classpath exception` in multiple files, affects copyright header only.

Please leave the java.lang.foreign changes out of this. We already have another PR for those:
https://github.com/openjdk/jdk/pull/15042

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PR Comment: https://git.openjdk.org/jdk/pull/15070#issuecomment-1655699357