Temporarily disable benchmark's native target

[fzhinkin]

Currently, we can't upgrade Kotlin plugin version to 1.9, because benchmarks module's configuration will fail processing native targets (kotlinx-benchmark plugin has to bump up Kotlin version to 1.9 too, but it requires Gradle 8.3 which is not released yet).
At the same time, we can't run benchmarks for native targets due to Kotlin/kotlinx-benchmark#114, so it seems reasonable to disable native target for now and unblock us from upgrading Kotlin's version to 1.9.