MINIFICPP-2505 SchedulingAgent::scheduled_processors_ isnt thread safe #5772

Job	Run time
ubuntu-22.04-clang	24m 24s
Docker build for integration tests	38m 40s
rocky	23m 37s
macos-xcode	37m 2s
ubuntu-24.04	16m 30s
windows-2022	58m 36s
Docker integration tests	25m 1s
	3h 43m 50s

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