Download artifact from PR comment issues

[Buckminsterfullerene02]

Describe the bug

When I downloaded UE4SS artifact from #1139 I found the following issues:

1. Directory structure was not maintained (everything in one folder) so had to manually move files into the right places
2. KismetDebuggerMod.dll/pdb was named as itself rather than as main which caused UE4SS to crash on startup when it tried to load incorrectly named dll
3. What is UVTD.exe/pdb and what is it for? Does it need to be in the PR artifact?

To reproduce

1. Open any recent PR that creates artifact comment
2. Download artifact .zip
3. See contents of .zip

Expected behavior

1. Directory structure is the correct one so the install of the zip is just extract into normal place and it's all there
2. KismetDebuggerMod to be named correctly
3. No idea

[UE4SS]

Just noting that this isn't new behavior, it seems to have been the same back when we used xmake.

These are good suggestions, and UVTD is what we use to generate vtable and member variable files, not useful for end-users, however, these artifacts aren't necessarily only aimed at end-users.

[narknon]

Yeah, for my use case flat structure is better. I do have some edits to the script that would do the folder structure and only provide uvtd if anything related to it was modified. It would be kinda useful to have the uvtd version that went with a particular PR always available though, especially if we're doing more code gen stuff in the future.