Populate x509.Certificate.Policies field #7619

Job	Run time
govulncheck	10s
vendorcheck (1.22.5)	33s
b (go1.23.1_2024-09-05, ./t.sh --lints --generate)	1m 14s
b (go1.23.1_2024-09-05, ./t.sh --integration)	1m 16s
b (go1.23.1_2024-09-05, ./tn.sh --integration)	1m 18s
b (go1.23.1_2024-09-05, ./t.sh --unit --enable-race-detection)	1m 15s
b (go1.23.1_2024-09-05, ./tn.sh --unit --enable-race-detection)	1m 23s
b (go1.23.1_2024-09-05, ./t.sh --start-py)	1m 15s
Boulder CI Test Matrix	1s
	8m 25s

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