chore: Fix auth integ test crashing when test fails

[vincetran]

• PR title and description conform to Pull Request guidelines.

Issue #, if available: N/A

Description of changes:

The JUnit framework captures only assertion errors in the main thread running the test. It is not aware of exceptions from within new spawn threads. In order to do it right, you should communicate the thread's termination state to the main thread. You should synchronize the threads correctly, and use some kind of shared variable to indicate the nested thread's outcome.

As such, by calling the JUnit fail() or assert*() methods from within any of the onSuccess/onFailure callbacks would end up crashing the integration test because those callbacks are ultimately called within a coroutine.

Used helper methods provided by Matt to refactor all of the integration tests to use them which also simplifies the test code overall so we don't need to actually use a latch anymore.

How did you test these changes?
(Please add a line here how the changes were tested)

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Ensure commit message has the appropriate scope (e.g fix(storage): message, feat(auth): message, chore(all): message)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.94%. Comparing base (ae14a5c) to head (d2ba2d6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3077      +/-   ##
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- Coverage   51.96%   51.94%   -0.02%     
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  Files        1033     1033              
  Lines       31335    31335              
  Branches     4537     4537              
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- Hits        16282    16277       -5     
- Misses      13366    13370       +4     
- Partials     1687     1688       +1     

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