test: skip hmr-ssr circular test (#19809)

Author: hi-ogawa

playground/hmr-ssr/__tests__/hmr-ssr.spec.ts

@@ -844,7 +844,8 @@ if (!isBuild) {
     await untilUpdated(() => hmr('.optional-chaining')?.toString(), '2')
   })
 
-  test('hmr works for self-accepted module within circular imported files', async () => {
+  // TODO: this is flaky due to https://github.com/vitejs/vite/issues/19804
+  test.skip('hmr works for self-accepted module within circular imported files', async () => {
     await setupModuleRunner('/self-accept-within-circular/index')
     const el = () => hmr('.self-accept-within-circular')
     expect(el()).toBe('c')
@@ -864,6 +865,7 @@ if (!isBuild) {
   test('hmr should not reload if no accepted within circular imported files', async (ctx) => {
     // TODO: Investigate race condition that causes an inconsistent behaviour for the last `untilUpdated`
     // assertion where it'll sometimes receive "mod-a -> mod-b (edited) -> mod-c -> mod-a (expected no error)"
+    // This is probably related to https://github.com/vitejs/vite/issues/19804
     ctx.skip()
 
     await setupModuleRunner('/circular/index')