Exclude unsupported language versions from gradle options

^KT-36146 Fixed

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/DefaultValues.kt

@@ -32,7 +32,9 @@ open class DefaultValues(val defaultValue: String, val possibleValues: List<Stri
 
     object LanguageVersions : DefaultValues(
         "null",
-        LanguageVersion.values().map { "\"${it.description}\"" }
+        LanguageVersion.values()
+            .filterNot { it.isUnsupported }
+            .map { "\"${it.description}\"" }
     )
 
     object JvmTargetVersions : DefaultValues(

libraries/tools/kotlin-gradle-plugin-api/src/main/kotlin/org/jetbrains/kotlin/gradle/dsl/KotlinCommonOptions.kt

@@ -6,14 +6,14 @@ interface KotlinCommonOptions  : org.jetbrains.kotlin.gradle.dsl.KotlinCommonToo
 
     /**
      * Allow using declarations only from the specified version of bundled libraries
-     * Possible values: "1.0", "1.1", "1.2", "1.3", "1.4"
+     * Possible values: "1.2 (DEPRECATED)", "1.3", "1.4", "1.5 (EXPERIMENTAL)"
      * Default value: null
      */
      var apiVersion: kotlin.String?
 
     /**
      * Provide source compatibility with the specified version of Kotlin
-     * Possible values: "1.0", "1.1", "1.2", "1.3", "1.4"
+     * Possible values: "1.2 (DEPRECATED)", "1.3", "1.4", "1.5 (EXPERIMENTAL)"
      * Default value: null
      */
      var languageVersion: kotlin.String?