Record the deprecation of the observability endpoints on webServer in
doc/deprecations.md, so the removal target is in one place next to the
other active deprecations.
The webServer /healthz, the frps webServer /metrics with its top-level
enablePrometheus switch, and the pprof handlers with webServer.pprofEnable
are deprecated since v0.72.0, when metricsServer was added. They are
replaced by metricsServer, whose /healthz, /metrics and pprofEnable are
independent of the dashboard listener.
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