Fix R restart test with new Kallichore build (#5387)

Addresses #5356; fixes
restarts on R and re-enables the R console tests.

The bug was upstream, in the supervisor; the issue was that during a
restart, the channel that broadcast status updates to the client would
blink offline. If the 'starting' status got sent during that blink, the
client would miss it and not detect startup correctly. The fix is to
ensure the channel always broadcasts updates throughout the restart
cycle.

### QA Notes

As noted by @jonvanausdeln, this is 100% reproducible on Windows, so it
should be easy to test the fix there.

extensions/positron-supervisor/package.json

@@ -97,7 +97,7 @@
   },
   "positron": {
     "binaryDependencies": {
-      "kallichore": "0.1.18"
+      "kallichore": "0.1.19"
     }
   },
   "dependencies": {

test/smoke/src/areas/positron/console/r-console.test.ts

@@ -7,8 +7,7 @@ import { expect } from '@playwright/test';
 import { Application, PositronRFixtures } from '../../../../../automation';
 import { setupAndStartApp } from '../../../test-runner/test-hooks';
 
-// Skipping due to https://github.com/posit-dev/positron/issues/5356
-describe.skip('Console Pane: R', () => {
+describe('Console Pane: R', () => {
 	setupAndStartApp();
 
 	describe('R Console Restart #web #win', () => {