Scheduler: implement remove_condition #1394

Job	Run time
select-runner	1s
build (3.7, x64, ubuntu)	1h 0m 16s
build (3.7, x64, windows)	1h 3m 32s
build (3.11, x64, ubuntu)	1h 30m 6s
build (3.11, x64, macos)	1h 3m 53s
build (3.11, x64, windows)	1h 38m 11s
build (3.9, macos, --cov=psyneulink)	1h 32m 8s
build (3.9, ubuntu, --forked -m "not llvm")	39m 20s
build (3.8, x86, windows)	1h 45m 45s
build (3.10, ubuntu, --fp-precision=fp32)	1h 23m 30s
build (3.10, macos, -m benchmark --benchmark-enable --benchmark-only --benchmark-min-rounds=2 --b...	52m 29s
build (3.7, x64, ubuntu, min)	1h 1m 48s
build (3.8, x64, macos)	52m 36s
	14h 23m 35s

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