Remove kernel.schedule (deprecated) #3316

Job	Run time
Conda Examples	1m 57s
Tests for downstream project Firedrake	7m 47s
Tests for downstream project arraycontext	2m 28s
Documentation	1m 24s
Tests for downstream project meshmode	7m 59s
Mypy	1m 25s
Tests for downstream project grudge	7m 59s
Pylint	1m 35s
Tests for downstream project pytential	7m 57s
Conda Pytest (ubuntu-latest)	3m 50s
Tests for downstream project pytato	6m 11s
Conda Pytest with Intel CL	3m 42s
Conda Pytest without arg check	4m 0s
Conda Pytest (macos-latest)	5m 6s
Conda Pytest Twice (for cache behavior)	5m 15s
Ruff	8s
Typos	6s
Validate CITATION.cff	8s
	1h 8m 57s

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