Drop benchmarks #2965

Job	Run time
Conda Pytest (ubuntu-latest)	10m 28s
Conda Pytest (macos-latest)	14m 26s
Mypy	6m 28s
Flake8	35s
Pylint	6m 15s
Conda Pytest with Intel CL	7m 15s
Tests for downstream project Firedrake	18m 36s
Documentation	5m 19s
Tests for downstream project arraycontext	6m 3s
Tests for downstream project meshmode	22m 33s
Tests for downstream project grudge	13m 52s
Tests for downstream project pytential	48m 58s
Tests for downstream project pytato	10m 36s
Conda Examples	5m 40s
Conda Pytest without arg check	10m 21s
Conda Pytest Twice (for cache behavior)	10m 5s
	3h 17m 30s

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