CPU spikes occur when navigating the Scene View with the grid enabled using DX12

How to reproduce:

1. Create an empty project
2. Make sure the project is using Direct3D12
3. In the Scene View toolbar, enable the Grid visibility toggle so the ground grid is visible
4. Open the Profiler (Window -> Analysis -> Profiler)
5. Set Profiler to Edit Mode
6. In the Scene View, hold RMB to enter flythrough mode
7. Move the Scene View camera above and below the grid using Q/E
8. Observe the Profiler

Actual result: Profiler spikes occur when navigating the Scene View with the grid enabled (up to ~70ms per frame on DX12)
Expected result: Navigating the Scene View with the grid enabled does not cause Profiler spikes or visible Editor slowdown

Reproducible with: 2023.1.0a4, 6000.0.74f1, 6000.3.14f1, 6000.4.7f1, 6000.5.0b8, 6000.6.0а5

Reproducible on: Windows 11
Not reproducible on: No other environment tested

Notes:

• In 6000.5.0b6 and 6000.6.0a4, the spike pattern is slightly different and additional isolates spikes can appear.
• The main profiler markers associated with the spikes are GfxDeviceD3D12.WaitForLastPresentation.WaitForGPU and Semaphore.WaitForSignal