Improve reliability of Click to Load integration tests

[kzar]

While they run reliably locally, some of the Click to Load integration
tests are flaking on CI. These improvements aim to help reduce those
flakes:

• If a test page fails to load, let's mark the test as skipped rather
  than as a failure. There's not much we can do to get around network
  failure.
• Take care to wait between unblocking a YouTube video and clicking
  to play it.
• Take care to wait for pages to finish closing.
• Avoid exceeding Jasmine's 20 second timeout when waiting for the
  extension configuration to load. If extension configuration fails
  to load, throw a clear exception to explain that.
• When clicking the Facebook Click to Load buttons, ignore buttons
  that Puppeteer fails to click.
• Fix a bug where the test extension configuration would still
  attempt to be unloaded, even when the test configuration failed to
  load.
• When API schema tests timeout, mark them as skipped with a clear
  message.
• If embedded Facebook content does not load within 15 seconds, time
  out but continue with the tests.
• If spherical video roll test times out, mark the test as pending
  and log an appropriate message. This happens when the network is
  too slow and the video fails to load within 30 seconds.

Reviewer: @jonathanKingston

Steps to test this PR:

1. Ensure integration tests pass more reliably.

Automated tests:

• Unit tests
• Integration tests

Reviewer Checklist:

• Ensure the PR solves the problem
• Review every line of code
• Ensure the PR does no harm by testing the changes thoroughly
• Get help if you're uncomfortable with any of the above!
• Determine if there are any quick wins that improve the implementation

PR Author Checklist:

• Get advice or leverage existing code
• Agree on technical approach with reviewer (if the changes are nuanced)
• Ensure that there is a testing strategy (and documented non-automated tests)
• Ensure there is a documented monitoring strategy (if necessary)
• Consider systems implications

[jonathanKingston]

Thanks for the detailed comment, I'm happy that what you described is what it's doing and the test is now passing 🥳

Thanks for fixing this up so quickly!