Revisit `dcgmproftesters` and fix `dcgmi diag` (#41) #24

Job	Run time
check / lint	21s
check / build (ubuntu-22.04)	6m 23s
check / build (self-hosted, jammy, ARM64)	13m 12s
check / func (ubuntu-22.04)	1m 47s
check / func (self-hosted, jammy, ARM64)	2m 39s
release (ubuntu-22.04)	10m 17s
release (self-hosted, jammy, ARM64)	4m 13s
	38m 52s

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