RA: Add GetAuthorization method to filter disabled challenges (#7652) #6729

Job	Run time
b (go1.22.5_2024-07-03, ./t.sh --lints --generate)	2m 48s
b (go1.22.5_2024-07-03, ./t.sh --lints --generate)	2m 55s
govulncheck	16s
govulncheck	16s
vendorcheck (1.22.5)	13s
vendorcheck (1.22.5)	13s
b (go1.22.5_2024-07-03, ./t.sh --integration)	5m 44s
b (go1.22.5_2024-07-03, ./t.sh --integration)	5m 44s
b (go1.22.5_2024-07-03, ./tn.sh --integration)	7m 54s
b (go1.22.5_2024-07-03, ./tn.sh --integration)	7m 54s
b (go1.22.5_2024-07-03, ./t.sh --unit --enable-race-detection)	6m 47s
b (go1.22.5_2024-07-03, ./t.sh --unit --enable-race-detection)	6m 42s
b (go1.22.5_2024-07-03, ./tn.sh --unit --enable-race-detection)	7m 1s
b (go1.22.5_2024-07-03, ./tn.sh --unit --enable-race-detection)	6m 42s
b (go1.22.5_2024-07-03, ./t.sh --start-py)	2m 42s
b (go1.22.5_2024-07-03, ./t.sh --start-py)	2m 42s
Boulder CI Test Matrix	1s
Boulder CI Test Matrix	1s
	1h 6m 35s

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