[Wasm] Update testData after adding K2 and new test infra support.

- Actualize muted K2 tests
- Actualize muted K1 tests with module systems because legacy Wasm test
  infra had no respect for "// MODULE: ..." test directives

compiler/testData/codegen/box/checkcastOptimization/kt47851.kt

@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
 // FIR status: result.getMethod OK in FE1.0, unresolved in FIR
 
 class C(val value: String) {