client/ui: more understandable connection lost messages #13762

Job	Run time
Build Cache	19s
Client (Docker) / Unit	9m 30s
Management / Unit (amd64, mysql)	4m 23s
Relay / Unit (386)	2m 36s
Client / Unit (amd64)	10m 40s
Signal / Unit (amd64)	59s
Relay / Unit (amd64, -race)	3m 26s
Management / Unit (amd64, sqlite)	3m 1s
Client / Unit (386)	9m 24s
Signal / Unit (386)	1m 7s
Management / Unit (amd64, postgres)	4m 3s
Management / Benchmark	0s
Management / Benchmark (API)	0s
Management / Integration	0s
	49m 28s

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