feat: simplify `boards2` implementation #9145

Job	Run time
Run Main (autocounterd) / Go Build / generated	19s
Run Main (autocounterd) / Go Linter / lint	27s
Run Main (autocounterd) / Go Test / test	28s
Run Main (docker-integration) / Go Build / generated	6s
Run Main (docker-integration) / Go Linter / lint	8s
Run Main (docker-integration) / Go Test / test	26s
Run Main (genproto) / Go Build / generated	11s
Run Main (genproto) / Go Linter / lint	23s
Run Main (genstd) / Go Build / generated	11s
Run Main (genproto) / Go Test / test	25s
Run Main (genstd) / Go Linter / lint	20s
Run Main (genstd) / Go Test / test	1m 2s
Run Main (goscan) / Go Build / generated	6s
Run Main (goscan) / Go Linter / lint	16s
Run Main (goscan) / Go Test / test	17s
Run Main (loop) / Go Build / generated	9s
Run Main (loop) / Go Linter / lint	36s
Run Main (loop) / Go Test / test	39s
	6m 29s

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