[llvm] [Dexter] Adjust launch sequencing to align closer with DAP spec (PR #170523)

[Janet Yang via llvm-commits]

https://github.com/qxy11 approved this pull request.

Thanks for taking the time to dig into this and the detailed explanation on the DAP spec! I think this approach makes sense.

https://github.com/llvm/llvm-project/pull/170523