Add `mintV2` loadtest #3784

Job	Run time
Compilation check	1m 42s
Docker build check	3m 44s
Format check	19s
cross compilation	12m 18s
run itests	11m 56s
run itests postgres	20m 33s
Lint check	2m 45s
migration version check	14s
go mod check	24s
RPC check	1m 13s
run LiT tests	15m 49s
sample configuration check	39s
Sqlc check	2m 40s
test vector check	1m 2s
run unit tests (unit-race)	14m 59s
run unit tests (unit-cover)	4m 57s
run unit tests (unit dbbackend=postgres)	6m 29s
finish	3s
	1h 41m 46s

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