[Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension#8131

Evangelink merged 5 commits into

mainmicrosoft/testfx:mainfrom

test-assist/logging-manager-and-extension-validation-tests-v7-117fbe2f3bea215fmicrosoft/testfx:test-assist/logging-manager-and-extension-validation-tests-v7-117fbe2f3bea215fCopy head branch name to clipboard