RFR: 8347814: Make all imports consistent in the FFM API tests and benchmarks

[Per Minborg]

On Wed, 19 Feb 2025 09:22:09 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes to make all imports consistent in the FFM API tests and benchmarks.
> 
> This is a follow-up PR from https://github.com/openjdk/jdk/pull/22827
> 
> Passes tier1-3

In the end, this didn't make the bar in terms of cost/benefit.  For example, backporting might be impacted.

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PR Comment: https://git.openjdk.org/jdk/pull/23689#issuecomment-2837727676