go: Use errors.Is over == #1632

Job	Run time
compiler (ubuntu-20.04)	3m 7s
compiler (ubuntu-22.04)	2m 45s
lib-java-kotlin	4m 31s
lib-php (7.1)	57s
lib-php (7.2)	1m 5s
lib-go (1.21)	1m 45s
lib-python (3.x)	1m 33s
lib-php (7.3)	1m 10s
lib-go (1.22)	1m 53s
lib-rust	3m 41s
lib-php (7.4)	1m 7s
lib-swift	1m 18s
lib-php (8)	1m 25s
lib-php (8.1)	1m 14s
lib-php (8.2)	1m 17s
lib-php (8.3)	1m 9s
cross-test (java, java,kotlin)	1m 46s
cross-test (java, go,rs)	1m 54s
cross-test (java, swift)	31s
cross-test (kotlin, java,kotlin)	29s
cross-test (kotlin, go,rs)	30s
cross-test (kotlin, swift)	32s
cross-test (go, java,kotlin)	52s
cross-test (go, go,rs)	49s
cross-test (go, swift)	49s
cross-test (rs, java,kotlin)	1m 8s
cross-test (rs, go,rs)	45s
cross-test (rs, swift)	1m 16s
cross-test (swift, java,kotlin)	57s
cross-test (swift, go,rs)	1m 7s
cross-test (swift, swift)	29s
	43m 51s

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