prepare changelog for v0.124.0 (#6138) #12865

Job	Run time
setup-environment	1m 24s
generate-metrics	5m 56s
gofmt	5m 44s
lint	11m 51s
tidy	1m 54s
test	16m 45s
coverage	12m 6s
cross-compile (binaries-darwin_amd64)	5m 25s
cross-compile (binaries-darwin_arm64)	5m 7s
cross-compile (binaries-linux_amd64)	5m 13s
cross-compile (binaries-linux_arm64)	5m 7s
cross-compile (binaries-windows_amd64)	5m 8s
cross-compile (binaries-linux_ppc64le)	5m 14s
	1h 26m 54s

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