feature: change the name of exposed workflows in the mcp server

It would be nice to be able to customize the name of each script exposed on the MCP servers.

Right now, the name is generated automatically from the script's path, which quickly becomes noisy and very long as soon as directories are involved.

I was wondering if it would be possible to add a setting inside each script, maybe in the advanced menu, to choose the exact name we want. That way, we could also get rid of the "f-f" added to the names and the double underscore ("__") that appears when a script is inside a directory.

For the sake of simplicity, I think custom names should be unique across the whole Windmill instance.