CA: Load multiple certificate profiles #5739

Job	Run time
govulncheck (1.21.5)	33s
b (go1.21.5_2024-02-14, ./t.sh --lints --generate)	1m 50s
b (go1.21.5_2024-02-14, ./t.sh --integration && ./test/test-caa-log-checker.sh)	4m 25s
vendorcheck (1.21.5)	15s
b (go1.21.5_2024-02-14, ./tn.sh --integration)	6m 21s
b (go1.21.5_2024-02-14, ./t.sh --unit --enable-race-detection)	5m 52s
b (go1.21.5_2024-02-14, ./tn.sh --unit --enable-race-detection)	5m 41s
b (go1.21.5_2024-02-14, ./t.sh --start-py)	1m 23s
b (go1.22.0_2024-02-14, ./t.sh --lints --generate)	43s
b (go1.22.0_2024-02-14, ./t.sh --integration && ./test/test-caa-log-checker.sh)	4m 13s
b (go1.22.0_2024-02-14, ./tn.sh --integration)	6m 30s
b (go1.22.0_2024-02-14, ./t.sh --unit --enable-race-detection)	5m 32s
b (go1.22.0_2024-02-14, ./tn.sh --unit --enable-race-detection)	5m 30s
b (go1.22.0_2024-02-14, ./t.sh --start-py)	1m 23s
Boulder CI Test Matrix	1s
	50m 12s

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