Fix intermittent failures on TestBeatmapDownloadingFlow due to slow realm refresh

[peppy]

Got this one locally while running a normal test run...

TearDown : osu.Framework.Testing.Drawables.Steps.AssertButton+TracedException : ensure beatmap available
--TearDown
   at osu.Framework.Threading.ScheduledDelegate.RunTaskInternal()
   at osu.Framework.Threading.Scheduler.Update()
   at osu.Framework.Graphics.Drawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Graphics.Containers.CompositeDrawable.UpdateSubTree()
   at osu.Framework.Platform.GameHost.UpdateFrame()
   at osu.Framework.Threading.GameThread.processFrame()
   at osu.Framework.Threading.GameThread.RunSingleFrame()
   at osu.Framework.Threading.GameThread.<createThread>g__runWork|64_0()
   at System.Threading.Thread.StartHelper.Callback(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)

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One or more child tests had errors
  Exception doesn't have a stacktrace

[runtime] 2022-03-10 11:24:55 [verbose]: 💨 Class: TestSceneOnlinePlayBeatmapAvailabilityTracker
[runtime] 2022-03-10 11:24:55 [verbose]: 🔶 Test:  TestBeatmapDownloadingFlow
[runtime] 2022-03-10 11:24:55 [verbose]: 🔸 Step #1 ensure beatmap unavailable
[runtime] 2022-03-10 11:24:55 [verbose]: 🔸 Step #2 state not downloaded
[runtime] 2022-03-10 11:24:55 [verbose]: 🔸 Step #3 start downloading
[runtime] 2022-03-10 11:24:55 [verbose]: 🔸 Step #4 state downloading 0%
[runtime] 2022-03-10 11:24:55 [verbose]: ✔️ 7 repetitions
[runtime] 2022-03-10 11:24:55 [verbose]: 🔸 Step #5 set progress 40%
[runtime] 2022-03-10 11:24:55 [verbose]: 🔸 Step #6 state downloading 40%
[runtime] 2022-03-10 11:24:55 [verbose]: 🔸 Step #7 finish download
[runtime] 2022-03-10 11:24:55 [verbose]: 🔸 Step #8 state importing
[runtime] 2022-03-10 11:24:55 [verbose]: 🔸 Step #9 allow importing
[runtime] 2022-03-10 11:24:55 [verbose]: 🔸 Step #10 wait for import
[database] 2022-03-10 11:24:55 [verbose]: [dce8f] Beginning import...
[database] 2022-03-10 11:24:55 [verbose]: [dce8f] Import successfully completed!
[runtime] 2022-03-10 11:24:55 [verbose]: ✔️ 170 repetitions
[runtime] 2022-03-10 11:24:55 [verbose]: 🔸 Step #11 ensure beatmap available
[runtime] 2022-03-10 11:24:55 [verbose]: 💥 Failed
[runtime] 2022-03-10 11:24:55 [verbose]: ⏳ Currently loading components (0)
[runtime] 2022-03-10 11:24:55 [verbose]: 🧵 Task schedulers
[runtime] 2022-03-10 11:24:55 [verbose]: LoadComponentsAsync (standard) concurrency:4 running:0 pending:0
[runtime] 2022-03-10 11:24:55 [verbose]: LoadComponentsAsync (long load) concurrency:4 running:0 pending:0
[runtime] 2022-03-10 11:24:55 [verbose]: 🎱 Thread pool
[runtime] 2022-03-10 11:24:55 [verbose]: worker:          min 32     max 32,767 available 32,766
[runtime] 2022-03-10 11:24:55 [verbose]: completion:      min 32     max 1,000  available 1,000