[llvm] [Dexter] Replace DAP "initialized" timeout with a warning (PR #174198)

[Ebuka Ezike via llvm-commits]

da-viper wrote:

> This patch is assuming that the issue is that LLDB sometimes takes more than 3s to send the initialised event after the launch request is sent; I'm not sure whether that's actually likely or not, but it looks like the most likely explanation of the issue right now.

Yeah it depends on the system. looking at the logs attached in the linked issue. 
it is running on macOS, I am not sure how this is handled in CI but I know locally macOS requires some authentication to start debugging, It also checks binaries before it runs it. and we are also running other test in parallel. 
It most likely will hit the timeout especially if its is a slower machine. 

I would prefer a higher number for the initialised timeout

https://github.com/llvm/llvm-project/pull/174198