feat(metrics): split control-plane worker-acquire latency by phase (#… #654

Job	Run time
build (ubuntu-latest, linux, amd64)	1m 44s
build (macos-15, darwin, amd64)	1m 59s
build (ubuntu-24.04-arm, linux, arm64)	1m 34s
build (macos-latest, darwin, arm64)	2m 8s
release	39s
	8m 4s

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