[IDE] Propagate KotlinFacetSettings version and completely drop isReleaseCoroutines flag

Also this commit removes number of tests related to support
  experimental coroutines

Original commit: af94bcebea

jps/jps-common/src/org/jetbrains/kotlin/config/KotlinFacetSettings.kt

@@ -160,7 +160,7 @@ data class ExternalSystemNativeMainRunTask(
 class KotlinFacetSettings {
     companion object {
         // Increment this when making serialization-incompatible changes to configuration data
-        val CURRENT_VERSION = 3
+        val CURRENT_VERSION = 4
         val DEFAULT_VERSION = 0
     }
 

jps/jps-common/src/org/jetbrains/kotlin/config/facetSerialization.kt

@@ -194,6 +194,10 @@ private fun readElementsList(element: Element, rootElementName: String, elementN
     return null
 }
 
+private fun readV3Config(element: Element): KotlinFacetSettings {
+    return readV2AndLaterConfig(element)
+}
+
 private fun readV2Config(element: Element): KotlinFacetSettings {
     return readV2AndLaterConfig(element)
 }
@@ -211,6 +215,7 @@ fun deserializeFacetSettings(element: Element): KotlinFacetSettings {
     return when (version) {
         1 -> readV1Config(element)
         2 -> readV2Config(element)
+        3 -> readV3Config(element)
         KotlinFacetSettings.CURRENT_VERSION -> readLatestConfig(element)
         else -> return KotlinFacetSettings() // Reset facet configuration if versions don't match
     }.apply { this.version = version }
@@ -397,7 +402,10 @@ fun Element.dropVersionsIfNecessary(settings: CommonCompilerArguments) {
 }
 
 fun KotlinFacetSettings.serializeFacetSettings(element: Element) {
-    val versionToWrite = if (version == 2) version else KotlinFacetSettings.CURRENT_VERSION
+    val versionToWrite = when (version) {
+        2, 3 -> version
+        else -> KotlinFacetSettings.CURRENT_VERSION
+    }
     element.setAttribute("version", versionToWrite.toString())
     writeLatestConfig(element)
 }