Maintenance: Improve retrying of tests when exceptions occur on the W…

…S handler.

(cherry picked from commit cc8b60a)

spec/support/capybara/websocket_server.rb

@@ -30,6 +30,10 @@
 
     # give thread time to terminate
     sleep 0.01 while websocket_server.status
+  rescue => e
+    # Handle any errors occuring within this hook, for example Net::ReadTimeout errors of the WS server.
+    #   Otherwise, they would not cause the retry to kick in, but abort the process.
+    example.example.set_exception(e)
   end
 
   def ensure_port_available!(port)