MM-46134: Skip flaky test PostStore//GetForThread (#20755)

https://mattermost.atlassian.net/browse/MM-46134

```release-note
NONE
```

store/storetest/post_store.go

@@ -568,6 +568,7 @@ func testPostStoreGetForThread(t *testing.T, ss store.Store) {
 	})
 
 	t.Run("Pagination", func(t *testing.T) {
+		t.Skip("MM-46134")
 		o1, err := ss.Post().Save(&model.Post{ChannelId: model.NewId(), UserId: model.NewId(), Message: NewTestId()})
 		require.NoError(t, err)
 		_, err = ss.Post().Save(&model.Post{ChannelId: o1.ChannelId, UserId: model.NewId(), Message: NewTestId(), RootId: o1.Id})