Delete TODO notes about restarts timing out.

jupyter/notebook#3705 noted some issues with kernel messages. I think these were mainly because we disconnected and reconnected the websocket on restart. We no longer do this, and these tests seem to pass, so let’s remove the TODO and keep an eye on it.

tests/test-services/src/kernel/ikernel.spec.ts

@@ -303,8 +303,6 @@ describe('Kernel.IKernel', () => {
       await emission;
     });
 
-    // TODO: seems to be sporadically timing out if we await the restart. See
-    // https://github.com/jupyter/notebook/issues/3705.
     it('should get a restarting status', async () => {
       const emission = testEmission(defaultKernel.statusChanged, {
         find: () => defaultKernel.status === 'restarting'
@@ -612,8 +610,6 @@ describe('Kernel.IKernel', () => {
   });
 
   describe('#restart()', () => {
-    // TODO: seems to be sporadically timing out if we await the restart. See
-    // https://github.com/jupyter/notebook/issues/3705.
     it('should restart and resolve with a valid server response', async () => {
       await defaultKernel.restart();
       await defaultKernel.ready;
@@ -646,8 +642,6 @@ describe('Kernel.IKernel', () => {
       await expectFailure(restart);
     });
 
-    // TODO: seems to be sporadically timing out if we await the restart. See
-    // https://github.com/jupyter/notebook/issues/3705.
     it('should dispose of existing comm and future objects', async () => {
       const kernel = defaultKernel;
       const comm = kernel.connectToComm('test');