wsi/wayland: Dispatch event queue in wsi_wl_swapchain_queue_presentHEADmain

With explicit sync, only if it wasn't done earlier for FIFO.

Prevents potentially unbounded memory usage for (wl_buffer.release
events in) the queue, since we don't dispatch the queue anywhere else
with explicit sync.

v2:
* Use wl_display_dispatch_queue_pending instead of
  wl_display_dispatch_queue_timeout. (Sebastian Wick)
* Call it from wsi_wl_swapchain_queue_present instead of
  wsi_wl_swapchain_acquire_next_image_explicit. (Joshua Ashton)

Fixes: 5f7a5a27ef1b ("wsi: Implement linux-drm-syncobj-v1")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28874>

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