CA: Load multiple certificate profiles #5741

Job	Run time
vendorcheck (1.21.5)	12s
govulncheck (1.21.5)	34s
b (go1.21.5_2024-02-14, ./t.sh --lints --generate)	1m 28s
b (go1.21.5_2024-02-14, ./t.sh --integration && ./test/test-caa-log-checker.sh)	1m 28s
b (go1.21.5_2024-02-14, ./tn.sh --integration)	1m 30s
b (go1.21.5_2024-02-14, ./t.sh --unit --enable-race-detection)	5m 13s
b (go1.21.5_2024-02-14, ./tn.sh --unit --enable-race-detection)	5m 29s
b (go1.21.5_2024-02-14, ./t.sh --start-py)	1m 32s
b (go1.22.0_2024-02-14, ./t.sh --lints --generate)	39s
b (go1.22.0_2024-02-14, ./t.sh --integration && ./test/test-caa-log-checker.sh)	1m 25s
b (go1.22.0_2024-02-14, ./tn.sh --integration)	1m 29s
b (go1.22.0_2024-02-14, ./t.sh --unit --enable-race-detection)	5m 8s
b (go1.22.0_2024-02-14, ./tn.sh --unit --enable-race-detection)	5m 14s
b (go1.22.0_2024-02-14, ./t.sh --start-py)	1m 18s
Boulder CI Test Matrix	1s
	32m 40s

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