Add config section `metricsServer` #572

Job	Run time
editorconfig	4s
linting (lint_jsonnet)	6s
linting (lint_yaml)	5s
golden (capacity-alerts)	33s
linting (lint_adoc)	5s
golden (remote-write)	33s
test (capacity-alerts)	31s
golden (user-workload-monitoring)	32s
test (remote-write)	36s
golden (capacity-alerts-with-node-labels)	32s
golden (vsphere)	30s
test (user-workload-monitoring)	30s
golden (custom-rules)	33s
test (capacity-alerts-with-node-labels)	34s
golden (team-routing)	32s
test (vsphere)	28s
golden (release-4.14)	34s
test (custom-rules)	39s
golden (ovn-kubernetes)	31s
test (team-routing)	29s
golden (release-4.15)	30s
test (release-4.14)	31s
golden (release-4.16)	32s
test (ovn-kubernetes)	29s
test (release-4.15)	29s
test (release-4.16)	32s
	12m 0s

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