multi: anchor fee test coverage #2065

Job	Run time
Sqlc check	19s
test vector check	50s
Docker build check	2m 52s
cross compilation	3m 20s
Format check	26s
run itests	7m 14s
run itests postgres	12m 22s
Lint check	1m 57s
go mod check	29s
RPC check	1m 7s
run unit tests (unit-race)	4m 57s
run unit tests (unit-cover)	1m 41s
Compilation check	29s
run unit tests (unit dbbackend=postgres)	3m 43s
	41m 46s

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