feat(minor): Manually build benchmarktool as release config

[hassila]

Description

Build the BenchmarkTool in release mode manually so we can use the optimised version for (much) faster JSON processing and benchmark reporting - this is a workaround for https://github.com/apple/swift-package-manager/issues/7210

How Has This Been Tested?

Manually tested with both package-benchmark and SwiftNIO benchmarks.

Minimal checklist:

• [x] I have performed a self-review of my own code
• [ ] I have added DocC code-level documentation for any public interfaces exported by the package
• [ ] I have added unit and/or integration tests that prove my fix is effective or that my feature works

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (2d3544e) 70.40% compared to head (6583976) 70.40%.

Additional details and impacted files

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[github-actions[bot]]

Pull request benchmark comparison [ubuntu-latest] with 'main' run at 2023-12-21T09:12:32+00:00 Pull request had performance regressions