Explicitly close the Engine Connection when ICE fails (#732)

This will avoid letting the stack think its ready until it times out,
and will hopefully help with faster retry logic in the future

Signed-off-by: Paul Tagliamonte <paul@kittycad.io>

src/lang/std/engineConnection.ts

@@ -360,6 +360,11 @@ export class EngineConnection {
             if (this.shouldTrace()) {
               iceSpan.resolve?.()
             }
+          } else if (this.pc?.iceConnectionState === 'failed') {
+            // failed is a terminal state; let's explicitly kill the
+            // connection to the server at this point.
+            console.log('failed to negotiate ice connection; restarting')
+            this.close()
           }
         })