Add metrics for websocket client termination/rejection#5495
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Description of Changes
This adds two metrics:
ws_client_disconnections, andws_client_rejectionsto track the different causes for clients that are disconnected. If clients are disconnected before we consider them connected, they count towardws_client_rejectionsinstead ofws_client_disconnections. These metrics are labeled by cause and db, and the causes are discussed incrates/core/src/worker_metrics/mod.rs.Expected complexity level and risk
Testing
There are some basic unit tests.