fix: fixed issues with test suite instability

[philasmar]

Description of changes:
The tests in the release pipeline have been consistently failing due to stability issues. The tests interfere with each other and are not properly set up to run in parallel. Given that the test projects target multiple frameworks, the test runs affect each other even if tests within a certain class run sequentially. This PR applies multiple fixes to the tests to ensure a stable and consistent run.

• Updated log group names to contain unique elements. This was the main issue since several tests publish to a log group with the same name. This affected event count assertions and test cleanup.
• Updated function calls to use async/await
• Updated certain threading calls to more recent versions of those calls. Task.Factory.StartNew -> Task.Run, Thread.Sleep -> Task.Delay, etc ...

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