Prepare 0.123.0 changelog (#6119) #12785

Job	Run time
setup-environment	1m 27s
coverage	11m 49s
cross-compile (binaries-darwin_amd64)	5m 6s
cross-compile (binaries-darwin_arm64)	5m 14s
cross-compile (binaries-linux_amd64)	5m 13s
cross-compile (binaries-linux_arm64)	5m 1s
cross-compile (binaries-windows_amd64)	5m 10s
cross-compile (binaries-linux_ppc64le)	5m 10s
generate-metrics	5m 49s
gofmt	5m 46s
lint	12m 11s
test	12m 11s
tidy	2m 4s
	1h 22m 11s

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