kspKotlin depends on generateProto

[schmist]

Please see the minimal example here: https://github.com/schmist/ksp-proto-minimal and my comment here: #624

The problem we face is that for some unknown (at least to me) reason, the kspKotlin Gradle tasks depends on the generateProto task as soon as the protobuf plugin is added to the module. Please run ./gradlew :workload:kspKotlin --dry-run in the provided minimal example to reproduce.

Strangly the dependency disappears when changing the main/java source set reference in the affected module, e.g., add

sourceSets {
    main {
        java {
            setSrcDirs(srcDirs)
        }
    }
}

to the workload build.gradle.kts file.

Is this expected behavior? Versions 0.8.x do not have this issue.

In our (more complicated) build we additionally enforce that proto buffers are generated before running ksp which leads to a cyclic task dependency.