[Bug 100047] [IGT][CI] Change kms_sysfs_edid_timing test into a performance test

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100047

--- Comment #57 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Martin Peres from comment #56)
> User impact of a potentially slow EDID read is a high latency between
> hotplug and changes in the Desktop Environment.

This test is inspired by user bug reports where the desktop was frozen for 2s
because of a _single_ hotplug probe (not a hotplug storm, and iirc it was a
panel not even a crt which were slow due to load detection). To make it more
explicit, probe the connection status while moving the cursor/flipping -- that
should not block, as the locking should be distinct to allow that (mostly
curtesy of those old bug reports).

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