RFR: 8283198: Remove src/jdk.hotspot.agent/test

[Francesco Andreuzzi]

On Thu, 25 Sep 2025 17:25:08 GMT, Francesco Andreuzzi <fandreuzzi at openjdk.org> wrote:

> According to the README, this is a manual test of `libproc.so`. The test has a non-standard structure, does not compile using the provided `Makefile`, and hasn't run possibly in a long time. Thus, I propose to remove it.

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/27496#issuecomment-3339086326