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clutter/frame-clock: Ignore missing presentation timestamps

Dor Askayo requested to merge doraskayo/mutter:ignore-missing-timestamps into main

From the commit message:

In some hardware configurations, presentation timestamps could be
missing from some page flip events, leading to a temporary loss of
vblank synchronization.

This occurs at least with AMD GPUs for atomic commits that only update
the cursor plane. [0]

In those cases, it's better to calculate the next update time
according to the last valid presentation timestamp instead of relying
on the dispatch lateness.

[0] https://gitlab.freedesktop.org/drm/amd/-/issues/2030

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