wfe: Use separate UpdateRegistrationContact & UpdateRegistrationKey methods #7298

Job	Run time
govulncheck	11s
vendorcheck (1.22.5)	27s
b (go1.23.1_2024-09-05, ./t.sh --lints --generate)	3m 30s
b (go1.23.1_2024-09-05, ./t.sh --integration)	5m 48s
b (go1.23.1_2024-09-05, ./tn.sh --integration)	7m 53s
b (go1.23.1_2024-09-05, ./t.sh --unit --enable-race-detection)	7m 37s
b (go1.23.1_2024-09-05, ./tn.sh --unit --enable-race-detection)	7m 40s
b (go1.23.1_2024-09-05, ./t.sh --start-py)	2m 45s
Boulder CI Test Matrix	1s
	35m 52s

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