chore: update output format in golangci-lint config and improve response writing in tests

.golangci.yml

@@ -7,3 +7,6 @@ linters:
 
 run:
   timeout: 5m
+
+output:
+  format: colored-line-number

device_storage_test.go

@@ -108,7 +108,7 @@ func newMockDeviceStorageServer() *httptest.Server {
 </SOAP-ENV:Envelope>`
 		}
 
-		w.Write([]byte(response))
+		_, _ = w.Write([]byte(response))
 	}))
 }