[KPM] Kotlin...CapabilitiesContainer: Remove API to read capabilities

libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/kpm/KotlinFragmentConfigurationDefinitionTest.kt

@@ -179,9 +179,6 @@ class KotlinFragmentConfigurationDefinitionTest : AbstractKpmExtensionTest() {
             override fun capability(notation: Any) {
                 setCapabilities.add(notation)
             }
-
-            override val capabilities: List<Capability> get() = throw NotImplementedError()
-
         }
 
         composite.setCapabilities(testCapabilitiesContainer, dummyFragment)

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/KotlinGradleFragmentConfigurationCapabilities.kt

@@ -19,7 +19,6 @@ internal typealias FragmentCapabilities<T> = KotlinGradleFragmentConfigurationCa
 interface KotlinGradleFragmentConfigurationCapabilities<in T : KotlinGradleFragment> {
     interface CapabilitiesContainer {
         fun capability(notation: Any)
-        val capabilities: List<Capability>
     }
 
     fun setCapabilities(container: CapabilitiesContainer, fragment: T)
@@ -43,7 +42,6 @@ private class CapabilitiesContainerImpl(
     private val publications: ConfigurationPublications
 ) : CapabilitiesContainer {
     override fun capability(notation: Any) = publications.capability(notation)
-    override val capabilities: List<Capability> get() = publications.capabilities.orEmpty().toList()
 }
 
 class KotlinGradleFragmentConfigurationCapabilitiesContext<T : KotlinGradleFragment> internal constructor(