RFR: 8342818: Implement CPU Time Profiling for JFR

[Johannes Bechberger]

On Tue, 24 Sep 2024 09:59:43 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> Tests that restarting the sampler works.
>
> It should be named something related to the CPU sampler, then. We already have many tests for starting multiple recordings.

I removed it, as I split the test in two and `TestCPUTimeMultipleRecordings.java` therefore already exists.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20752#discussion_r1773446969