Pause and resume manual test execution in Azure Test Plans

When manual testers are executing the steps of a particularly complicated or long-running test case, they may from time to time wish to pause their work and then resume it later. Today this is more complicated and less intuitive than it should be. And some scenarios, such as resuming the execution of the test case in the desktop test runner, are not supported at all. This feature will focus on improving the experience of pausing and resuming test execution, including adding support for resuming execution in either the web or desktop test runners.