Cleanup code and changelog (#6251) #20291

Job	Run time
filter-changes	4s
unittests (ubuntu-22.04)	8m 24s
unittests (ubuntu-latest-arm-8-cores)	10m 0s
lint	2m 17s
build (ubuntu-22.04)	1m 7s
unittests (self-hosted, macOS, ARM64, go-spacemesh)	4m 47s
quicktests	1m 55s
build (ubuntu-latest-arm-8-cores)	3m 30s
unittests (windows-2022)	15m 49s
build (macos-13)	1m 55s
build (self-hosted, macOS, ARM64, go-spacemesh)	23s
build (windows-2022)	5m 18s
ci-status	9s
	55m 38s

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