✨🏗 Add expectAsyncConsoleError, which enables tests to check for async errors

[rsimha]

The allowConsoleError construct lets you capture synchronous calls to console.error in a test, and indicate that they are expected and that the test shouldn't fail. However, when test code results in asynchronous errors, there's no good way to use allowConsoleError as written today.

This PR does the following:

• Introduces a new construct called expectAsyncConsoleError, which lets you specify that a given asynchronous console.error is expected at some point during the test.
  • When the error eventually appears in the test, it is ignored.
  • If the expected error doesn't appear by the time the test ends, an error is thrown.
• Adds an expectAsyncConsoleError annotation to all tests in extensions/amp-analytics/0.1/test/test-amp-analytics.js that were resulting in async errors
• Undoes the temporary workaround added by Temporarily disable console error check in test-amp-analytics.js unti… #15606

Fixes #15609
Required for #14406

[rsimha]

/to @lannka @choumx

[lannka]

Awesome! Thx!