ra: clean up countFailedValidations #7157

Job	Run time
vendorcheck (1.22.5)	14s
vendorcheck (1.22.5)	14s
govulncheck	17s
govulncheck	17s
b (go1.23.1_2024-09-05, ./t.sh --lints --generate)	3m 36s
b (go1.23.1_2024-09-05, ./t.sh --lints --generate)	3m 36s
b (go1.23.1_2024-09-05, ./t.sh --integration)	5m 47s
b (go1.23.1_2024-09-05, ./t.sh --integration)	5m 47s
b (go1.23.1_2024-09-05, ./tn.sh --integration)	7m 57s
b (go1.23.1_2024-09-05, ./tn.sh --integration)	7m 57s
b (go1.23.1_2024-09-05, ./t.sh --unit --enable-race-detection)	7m 55s
b (go1.23.1_2024-09-05, ./t.sh --unit --enable-race-detection)	7m 55s
b (go1.23.1_2024-09-05, ./tn.sh --unit --enable-race-detection)	7m 41s
b (go1.23.1_2024-09-05, ./tn.sh --unit --enable-race-detection)	8m 12s
b (go1.23.1_2024-09-05, ./t.sh --start-py)	2m 57s
b (go1.23.1_2024-09-05, ./t.sh --start-py)	2m 57s
Boulder CI Test Matrix	1s
Boulder CI Test Matrix	1s
	1h 13m 21s

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