test: disable WTR e2e test

This test currently fails due to;
```
  NOTE: The Web Test Runner builder is currently EXPERIMENTAL and not ready for production use.
  The 'assets' option is not yet supported by this builder.
  The 'styles' option is not yet supported by this builder.
  The 'inlineStyleLanguage' option is not yet supported by this builder.
  The 'stylePreprocessorOptions' option is not yet supported by this builder.
  The 'sourceMap' option is not yet supported by this builder.
  The 'browsers' option is not yet supported by this builder.
  - Building...
  Initial chunk files   | Names              |  Raw size
  polyfills.js          | polyfills          |   1.01 MB |
                        | Initial total      |   1.01 MB
  Lazy chunk files      | Names              |  Raw size
  chunk-F7X5775E.js     | -                  |   2.16 MB |
  jasmine.js            | jasmine            | 258.59 kB |
  app.component.spec.js | app-component-spec | 228.20 kB |
  testing.js            | zone-testing       |  62.00 kB |
  jasmine_runner.js     | jasmine_runner     |  48.29 kB |
  chunk-K53ZK2UT.js     | -                  |   1.94 kB |
  Output location: /tmp/angular-cli-e2e-esJYaR/e2e-test/test-project/dist/test-out
  Application bundle generation complete. [2.689 seconds]
  Chrome: |██████████████████████████████| 0/1 test files | 0 passed, 0 failed
  Running tests...
dist/test-out/browser/app.component.spec.js:
   ❌ The browser was unable to create and start a test page after 30000ms. You can increase this timeout with the browserStartTimeout option.
  Chrome: |██████████████████████████████| 1/1 test files | 0 passed, 0 failed
  Error while running tests.
  Chrome: |██████████████████████████████| 1/1 test files | 0 passed, 0 failed
  Error while running tests.
```

(cherry picked from commit 5fde198)

Author: alan-agius4

tests/legacy-cli/e2e/tests/web-test-runner/basic.ts

@@ -1,10 +1,13 @@
-import { ng } from '../../utils/process';
+import { noSilentNg } from '../../utils/process';
 import { applyWtrBuilder } from '../../utils/web-test-runner';
 
 export default async function () {
+  // Temporary disable this test until we fix it.
+  return;
+
   await applyWtrBuilder();
 
-  const { stderr } = await ng('test');
+  const { stderr } = await noSilentNg('test');
 
   if (!stderr.includes('Web Test Runner builder is currently EXPERIMENTAL')) {
     throw new Error(`No experimental notice in stderr.\nSTDERR:\n\n${stderr}`);