build: several minor fixes related to using puppeteer (#35381)

This is a follow-up to #35049 with a few minor fixes related to using
the browser provided by `puppeteer` to run tests. Included fixes:

- Make the `webdriver-manager-update.js` really portable. (Previously,
  it needed to be run from the directory that contained the
  `node_modules/` directory. Now, it can be executed from a subdirectory
  and will correctly resolve dependencies.)

- Use the `puppeteer`-based setup in AIO unit and e2e tests to ensure
  that the downloaded ChromeDriver version matches the browser version
  used in tests.

- Use the `puppeteer`-based setup in the `aio_monitoring_stable` CI job
  (as happens with `aio_monitoring_next`).

- Use the [recommended way][1] of getting the browser port when using
  `puppeteer` with `lighthouse` and avoid hard-coding the remote
  debugging port (to be able to handle multiple instances running
  concurrently).

[1]: https://github.com/GoogleChrome/lighthouse/blame/51df179a0/docs/puppeteer.md#L49

PR Close #35381

aio/karma.conf.js

@@ -35,10 +35,10 @@ module.exports = function (config) {
       ChromeHeadlessNoSandbox: {
         base: 'ChromeHeadless',
         // See /integration/README.md#browser-tests for more info on these args
-        flags: ['--no-sandbox', '--headless', '--disable-gpu', '--disable-dev-shm-usage', '--hide-scrollbars', '--mute-audio']
-      }
+        flags: ['--no-sandbox', '--headless', '--disable-gpu', '--disable-dev-shm-usage', '--hide-scrollbars', '--mute-audio'],
+      },
     },
-    browsers: [process.env['CI'] ? 'ChromeHeadlessNoSandbox' : 'Chrome'],
+    browsers: ['ChromeHeadlessNoSandbox'],
     browserNoActivityTimeout: 60000,
     singleRun: false,
     restartOnFileChange: true,