Run smoke tests in parallel

The default parallelization of Playwright tests will parallelize across
multiple test files, but not within each file. There is currently only
one test file, so it makes sense to parallelize within the file.

<https://playwright.dev/docs/test-parallel#parallelize-tests-in-a-single-file>

test/smoke-test/urls.test.js

@@ -1,6 +1,8 @@
 const {readFileSync} = require('fs');
 const {expect, test} = require('@playwright/test');
 
+test.describe.configure({ mode: 'parallel' });
+
 const testCases = [];
 
 // Load a suite of smoke tests from a simple text file. File is of the format: