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

[Stephen Tozer via llvm-commits]

SLTozer wrote:

> you can add the timeout in the launch configuration. incase it is needed later. https://github.com/llvm/llvm-project/blob/main/lldb/tools/lldb-dap/README.md#configuring-lldb-dap-defaults

I haven't needed to use this feature for the patch, but just noting - Dexter isn't launching lldb-dap via VSCode, it implements a DAP client and launches lldb-dap directly. If it becomes an issue I could look into the vscode plugin and see how it communicates the timeout to lldb-dap, but I couldn't otherwise see documentation (not that I'd necessarily expect to find any) as to how to correctly populate the "configuration" section of the launch request (just adding a `configuration: {timeout: 10}` field didn't seem to have any effect).

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