Mark test_emdawnwebgpu_link_test as flaky. NFC (#25344)

See #25343

Author: sbc100

test/test_other.py

@@ -12242,6 +12242,7 @@ def test_standalone_syscalls(self):
   def test_webgpu_compiletest(self, args):
     self.run_process([EMXX, test_file('webgpu_jsvalstore.cpp'), '-Wno-error=deprecated', '-sUSE_WEBGPU', '-sASYNCIFY'] + args)
 
+  @flaky('https://github.com/emscripten-core/emscripten/issues/25343')
   @also_with_wasm64
   @parameterized({
     '': ([],),