CA: Load multiple certificate profiles #5726

Job	Run time
govulncheck (1.21.5)	30s
b (go1.21.5_2024-01-17, ./t.sh --lints --generate)	1m 28s
b (go1.21.5_2024-01-17, ./t.sh --integration && ./test/test-caa-log-checker.sh)	4m 27s
b (go1.21.5_2024-01-17, ./tn.sh --integration)	6m 25s
b (go1.21.5_2024-01-17, ./t.sh --unit --enable-race-detection)	5m 34s
vendorcheck (1.21.5)	16s
b (go1.21.5_2024-01-17, ./tn.sh --unit --enable-race-detection)	5m 33s
b (go1.21.5_2024-01-17, ./t.sh --start-py)	1m 24s
b (go1.22rc1_2024-01-17, ./t.sh --lints --generate)	47s
b (go1.22rc1_2024-01-17, ./t.sh --integration && ./test/test-caa-log-checker.sh)	4m 28s
b (go1.22rc1_2024-01-17, ./tn.sh --integration)	6m 35s
b (go1.22rc1_2024-01-17, ./t.sh --unit --enable-race-detection)	5m 30s
b (go1.22rc1_2024-01-17, ./tn.sh --unit --enable-race-detection)	5m 26s
b (go1.22rc1_2024-01-17, ./t.sh --start-py)	1m 22s
Boulder CI Test Matrix	1s
	49m 46s

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