[lldb-dap] Take two at refactoring the startup sequence. (#140331) This is more straight forward refactor of the startup sequence that reverts parts of ba29e60f9a2222bd5e883579bb78db13fc5a7588. Unlike my previous attempt, I ended up removing the pending request queue and not including an `AsyncReqeustHandler` because I don't think we actually need that at the moment. The key is that during the startup flow there are 2 parallel operations happening in the DAP that have different triggers. * The `initialize` request is sent and once the response is received the `launch` or `attach` is sent. * When the `initialized` event is recieved the `setBreakpionts` and other config requests are made followed by the `configurationDone` event. I moved the `initialized` event back to happen in the `PostRun` of the `launch` or `attach` request handlers. This ensures that we have a valid target by the time the configuration calls are made. I added also added a few extra validations that to the `configurationeDone` handler to ensure we're in an expected state. I've also fixed up the tests to match the new flow. With the other additional test fixes in 087a5d2ec7897cd99d3787820711fec76a8e1792 I think we've narrowed down the main source of test instability that motivated the startup sequence change.
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