Remove `.fail` files and update `.gitignore` #3713

Job	Run time
Docker build check	3m 42s
Docker build check	3m 42s
Format check	19s
Format check	19s
cross compilation	5m 14s
cross compilation	5m 14s
Compilation check	54s
Compilation check	54s
run itests	10m 51s
run itests	10m 51s
Lint check	2m 55s
Lint check	2m 55s
run itests postgres	13m 25s
run itests postgres	19m 11s
migration version check	11s
migration version check	11s
go mod check	24s
go mod check	24s
RPC check	1m 10s
RPC check	1m 10s
run LiT tests	14m 3s
run LiT tests	14m 3s
sample configuration check	40s
sample configuration check	40s
Sqlc check	2m 42s
Sqlc check	2m 42s
test vector check	1m 7s
test vector check	1m 7s
run unit tests (unit-race)	12m 35s
run unit tests (unit-race)	12m 35s
run unit tests (unit-cover)	3m 15s
run unit tests (unit-cover)	3m 15s
run unit tests (unit dbbackend=postgres)	6m 2s
run unit tests (unit dbbackend=postgres)	6m 2s
finish	2s
finish	2s
	2h 44m 48s

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