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feat: cxx_stdlib, the curriculum in CI, and two criteria that machine state decided #319

Job	Run time
invariants (linux-aarch64)	3m 33s
invariants (linux-x86_64)	4m 51s
invariants (windows-x86_64)	4m 29s
invariants (macos-arm64)	2m 47s
scan (windows-x86_64)	6m 30s
scan (macos-arm64)	5m 35s
scan (linux-aarch64)	3m 19s
scan (linux-x86_64)	7m 19s
coverage (every host the table names was scanned)	8s
	38m 31s