feat: simplify `boards2` implementation #6168

Job	Run time
setup	4s
Run Main (gnodev) / Go Linter / lint	35s
Run Main (gnodev) / Go Test / test	59s
Run Main (gnodev) / Go Build / generated	12s
Run Main (gnofaucet) / Go Build / generated	15s
Run Main (gnofaucet) / Go Linter / lint	28s
Run Main (gnogenesis) / Go Build / generated	6s
Run Main (gnofaucet) / Go Test / test	23s
Run Main (gnogenesis) / Go Test / test	29s
Run Main (gnogenesis) / Go Linter / lint	23s
Run Main (gnokeykc) / Go Linter / lint	39s
Run Main (gnokeykc) / Go Build / generated	6s
Run Main (gnokeykc) / Go Test / test	27s
Run Main (gnomd) / Go Linter / lint	29s
Run Main (gnomd) / Go Build / generated	7s
Run Main (gnomd) / Go Test / test	21s
Run Main (gnomigrate) / Go Build / generated	16s
Run Main (gnomigrate) / Go Linter / lint	26s
Run Main (gnomigrate) / Go Test / test	32s
	7m 17s

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