[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/coroutines/doubleColonExpressionsGenerationInBuilderInference.kt

@@ -1,5 +1,3 @@
-// IGNORE_BACKEND: JS, JS_IR
-// IGNORE_BACKEND: JS_IR_ES6
 // WITH_STDLIB
 
 package a.b
@@ -22,7 +20,7 @@ fun test() {
     }
 
     val size = a.toList().size
-    assert(size == 5) { "actual size: $size"}
+    require(size == 5) { "actual size: $size"}
 }
 
 fun box(): String {