RFR: 7508: Use preferred way for test-jars

[Marcus Hirt]

On Thu, 13 Jan 2022 11:04:00 GMT, Jean-Philippe Bempel <jpbempel at openjdk.org> wrote:

> based on https://maven.apache.org/plugins/maven-jar-plugin/examples/create-test-jar.html
> I have modified the way test jars are structured:
> we put all classes in src/main/java instead of src/test/java
> and changed scope from test to compile accordingly
> we now don't need to create explicitly test-jar neither reference them
> as is.
> Help to build/run/debug correctly in Intellij

Already doing these, i.e. fixing project files, in a separate PR. See #355.

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PR: https://git.openjdk.java.net/jmc/pull/354