[Wasm] stdlib API: make kotlin.assert internal

Being disabled by default
 and not well-documented, these functions cause confusion among early
 adopters as to why their code don't work properly.

Assert APIs need a proper design across Kotlin platforms.
 Since APIs are not available in common code and K/JS, it is premature
  to have such a general feature in a new experimental platform.

Compiler tests:
* Mute tests that rely on assert.
* Replace JVM-specific assert calls with require calls and unmute passed K/JS tests.

Merge-request: KT-MR-8636
Merged-by: Svyatoslav Kuzmich <svyatoslav.kuzmich@jetbrains.com>

compiler/testData/codegen/box/reified/newArrayInt.kt

@@ -1,8 +1,3 @@
-// IGNORE_BACKEND: JS_IR
-// IGNORE_BACKEND: JS_IR_ES6
-// TODO: muted automatically, investigate should it be ran for JS or not
-// IGNORE_BACKEND: JS
-
 // WITH_STDLIB
 
 inline fun<reified T> createArray(n: Int, crossinline block: () -> T): Array<T> {
@@ -13,6 +8,6 @@ fun box(): String {
 
     val x = createArray<Int>(5) { 3 }
 
-    assert(x.all { it == 3 })
+    require(x.all { it == 3 })
     return "OK"
 }