return sql.ErrNotFound if account doesn't exist (#6508) #21884

Job	Run time
filter-changes	7s
quicktests	1m 59s
lint	2m 43s
coverage	18m 21s
build (ubuntu-22.04)	1m 0s
unittests (ubuntu-22.04)	27m 46s
build (ubuntu-latest-arm-8-cores)	2m 15s
unittests (ubuntu-latest-arm-8-cores)	35m 15s
build (macos-13)	1m 55s
unittests (self-hosted, macOS, ARM64, go-spacemesh)	22m 25s
build (self-hosted, macOS, ARM64, go-spacemesh)	34s
unittests (windows-2022)	37m 51s
build (windows-2022)	6m 5s
ci-status	2s
	2h 38m 18s

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