RFR: 8331516: Tests should not use the "Classpath" exception form of the legal header

[Iris Clark]

On Thu, 2 May 2024 18:45:54 GMT, Phil Race <prr at openjdk.org> wrote:

> Change GPL+CP -> GPL as required for all tests.

Confirmed updated license matches the GPL template: https://github.com/openjdk/jdk/blob/master/make/data/license-templates/gpl-header

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Marked as reviewed by iris (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19068#pullrequestreview-2036665370