perf: use fmt.Fprintf to avoid unnecessary string+args + WriteString #8017

Job	Run time
setup	7s
Run Main (gnofaucet) / Go Build / generated	10s
Run Main (gnodev) / Go Build / generated	11s
Run Main (gnodev) / Go Lint / lint	49s
Run Main (gnodev) / Go Test / test	1m 20s
Run Main (github-bot) / Go Build / generated	7s
Run Main (github-bot) / Go Test / test	29s
Run Main (gnofaucet) / Go Lint / lint	33s
Run Main (github-bot) / Go Lint / lint	31s
Run Main (gnofaucet) / Go Test / test	39s
Run Main (gnogenesis) / Go Build / generated	7s
Run Main (gnogenesis) / Go Test / test	49s
Run Main (gnogenesis) / Go Lint / lint	42s
Run Main (gnohealth) / Go Build / generated	17s
Run Main (gnohealth) / Go Lint / lint	41s
Run Main (gnohealth) / Go Test / test	41s
Run Main (gnokeykc) / Go Build / generated	10s
Run Main (gnokeykc) / Go Lint / lint	43s
Run Main (gnokeykc) / Go Test / test	43s
Run Main (gnomd) / Go Build / generated	13s
Run Main (gnomd) / Go Lint / lint	31s
Run Main (gnomd) / Go Test / test	33s
Run Main (gnomigrate) / Go Build / generated	10s
Run Main (gnomigrate) / Go Lint / lint	42s
Run Main (gnomigrate) / Go Test / test	39s
	12m 37s

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