KMP: Support for removing test sources from the output

[EdricChan03]

Seems that the test sources are included by default - not sure if Dokka hid it by default, but it would be nice to have an option of excluding test sources from the resulting Dokka output.

Currently, a workaround would be to remove *Test sources by setting suppress to true

[aSemy]

Thanks for the report, I'll look into it after the Kotlin Multiplatform refactoring being done for #50. I suspect that will also fix this issue.

While the test source sets will be included in the generated dokka_parameters.json files, they should be excluded when they are actually sent to the Dokka generator:

dokkatoo/modules/dokkatoo-plugin/src/main/kotlin/tasks/DokkatooPrepareParametersTask.kt

Lines 146 to 150 in 9eadee7

	val sourceSets = dokkaSourceSets.filterNot {
	val suppressed = it.suppress.get()
	logger.info("Dokka source set ${it.sourceSetID.get()} ${if (suppressed) "is" else "isn't"} suppressed")
	suppressed
	}.map(DokkaSourceSetSpec::build)

I don't think suppressed is encoded to the dokka_parameters.json file, so maybe it's not being respected across subprojects.

[EdricChan03]

Test sources also seem to be excluded now as per #50, so I guess this can be closed as well