`[scheduling][special tasks]clock-trigger` marked as deprecated in docs but does not emit deprecation warning

[MetRonnie]

cylc-flow/cylc/flow/cfgspec/workflow.py

Lines 810 to 817 in 068a42a

	Conf('clock-trigger', VDR.V_STRING_LIST, desc='''
	Legacy clock trigger definitions.
	.. deprecated:: 8.0.0
	These are now auto-upgraded to the newer wall_clock xtriggers
	(see :ref:`Section External Triggers`). The old way defining
	clock-triggers will be removed in an upcoming Cylc version.

However neither cylc validate nor cylc lint emit a deprecation warning