Run kotlin-test-js tests with kotlin-stdlib-js

Rework kotlin-test common tests to make them runnable with qunit.
Change the way how asserter is overridden in js box tests.
Minor: remove unneeded test configs

libraries/kotlin.test/jvm/src/main/kotlin/AsserterLookup.kt

@@ -11,6 +11,8 @@ private val contributors = ArrayList<AsserterContributor>()
 
 internal impl fun lookupAsserter(): Asserter = lookup()
 
+private val defaultAsserter = DefaultAsserter()
+
 internal fun lookup(): Asserter {
     initContributorsIfNeeded()
 
@@ -21,7 +23,7 @@ internal fun lookup(): Asserter {
         }
     }
 
-    return DefaultAsserter()
+    return defaultAsserter
 }
 
 private fun initContributors() {