[Wasm] Stop dumping declarations in diagnostic tests

These tests are meant to check diagnostics, but
having to update .txt dumps adds some friction to development process.

wasm/wasm.tests/test/org/jetbrains/kotlin/wasm/test/diagnostics/AbstractDiagnosticsWasmTest.kt

@@ -51,7 +51,6 @@ abstract class AbstractDiagnosticsWasmTest : AbstractKotlinCompilerTest() {
         classicFrontendStep()
         classicFrontendHandlersStep {
             useHandlers(
-                ::DeclarationsDumpHandler,
                 ::ClassicDiagnosticsHandler,
             )
         }