disable on_demand_gc until AOT issues are identified (#31847)

Author: lewing

src/Platform/Mono/MonoPlatform.ts

@@ -427,7 +427,9 @@ function createEmscriptenModuleInstance(resourceLoader: WebAssemblyResourceLoade
       timeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;
     } catch { }
     MONO.mono_wasm_setenv("TZ", timeZone || 'UTC');
-
+    // Turn off full-gc to prevent browser freezing.
+    const mono_wasm_enable_on_demand_gc = cwrap('mono_wasm_enable_on_demand_gc', null, ['number']);
+    mono_wasm_enable_on_demand_gc(0);
     if (resourceLoader.bootConfig.modifiableAssemblies) {
       // Configure the app to enable hot reload in Development.
       MONO.mono_wasm_setenv('DOTNET_MODIFIABLE_ASSEMBLIES', resourceLoader.bootConfig.modifiableAssemblies);