MM-61225: Remove incorrect test (#28954)

This test actually tested that there is no race
_if_ session pooling is there. But there is no session pooling
any more so this test is irrelevant.

https://mattermost.atlassian.net/browse/MM-61225

```release-note
NONE
```

server/channels/app/platform/web_conn_test.go

@@ -10,7 +10,6 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"testing"
-	"time"
 
 	"github.com/gorilla/websocket"
 	"github.com/stretchr/testify/assert"
@@ -18,7 +17,6 @@ import (
 
 	"github.com/mattermost/mattermost/server/public/model"
 	"github.com/mattermost/mattermost/server/public/plugin"
-	"github.com/mattermost/mattermost/server/public/shared/i18n"
 )
 
 type hookRunner struct {
@@ -243,38 +241,3 @@ func TestWebConnDrainDeadQueue(t *testing.T) {
 		t.Run("Overwritten First", func(t *testing.T) { run(int64(128), deadQueueSize+10) })
 	})
 }
-
-// TestWebConnSessionRace guards against https://mattermost.atlassian.net/browse/MM-60307. It need to be run with the -race flag.
-func TestWebConnSessionRace(t *testing.T) {
-	th := Setup(t).InitBasic()
-	t.Cleanup(th.TearDown)
-
-	s := httptest.NewServer(dummyWebsocketHandler(t))
-	t.Cleanup(s.Close)
-	d := websocket.Dialer{}
-	c, _, err := d.Dial("ws://"+s.Listener.Addr().String()+"/ws", nil)
-	require.NoError(t, err)
-
-	err = th.Service.Start(nil)
-	require.NoError(t, err)
-
-	session, err := th.Service.CreateSession(th.Context, &model.Session{
-		UserId: th.BasicUser.Id,
-	})
-	require.NoError(t, err)
-	// Ensure LastActivityAt needs to get updated in the session store
-	session.LastActivityAt = session.LastActivityAt - model.SessionActivityTimeout - 1
-
-	cfg := &WebConnConfig{
-		WebSocket: c,
-		Session:   *session,
-		TFunc:     i18n.IdentityTfunc(),
-		Locale:    "en",
-	}
-	_ = th.Service.NewWebConn(cfg, th.Suite, &hookRunner{})
-
-	session.AddProp(model.SessionPropPlatform, "chrome")
-
-	// Wait a bit of the race checker to catch any
-	time.Sleep(100 * time.Millisecond)
-}