[IDE] Propagate KotlinFacetSettings version and completely drop isReleaseCoroutines flag

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

idea/idea-maven/test/org/jetbrains/kotlin/idea/maven/MavenUpdateConfigurationQuickFixTest.kt

@@ -72,11 +72,6 @@ class MavenUpdateConfigurationQuickFixTest : MavenImportingTestCase() {
         doTest("Set module language version to 1.1")
     }
 
-    @Test
-    fun testEnableCoroutines() {
-        doTest("Enable coroutine support in the current module")
-    }
-
     @Test
     fun testEnableInlineClasses() {
         doTest("Enable inline classes support in the current module")