Add processing by chunks to mac tests #92

Job	Run time
basic_clang	5m 32s
basic_gcc	5m 11s
check_docs	59s
check_update	1m 18s
check-ansi	2m 37s
address_ub_sanitizer	10m 20s
enable_non-default_options	4m 3s
full_featured	5m 46s
fuzz_tests	3m 1s
memory_sanitizer	18m 43s
minimal	2m 42s
no-deprecated	5m 8s
non-caching	14m 50s
no-shared-macos (macos-13)	5m 10s
no-shared-macos (macos-14)	3m 10s
no-shared-ubuntu	4m 8s
self-hosted	0s
threads_sanitizer	5m 29s
external-test-cf-quiche	3m 48s
external-test-pyca (1.51.0, 3.9)	6m 48s
external-tests	11m 48s
legacy	4m 7s
no-legacy	5m 6s
out-of-readonly-source-and-install-macos (macos-13)	10m 42s
out-of-readonly-source-and-install-macos (macos-14)	4m 39s
out-of-readonly-source-and-install-ubuntu	7m 13s
	2h 32m 18s

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