[llvm] [lldb] [lldb] Rename lldb-vscode to lldb-dap (PR #69264)

[Greg Clayton via llvm-commits]

clayborg wrote:

@JDevlieghere Can you delete the `llvm-project/lldb/tools/lldb-vscode` directory from git after this commit to clean up our codebase? There are still two copies of the `lldb-dap` code in the sources:
```
lldb/tools/lldb-dap
lldb/tools/lldb-vscode
```
I worry someone might make PR changes to the code in the `lldb-vscode` directory which is effectively dead at this point.

https://github.com/llvm/llvm-project/pull/69264