Add vscode context to limit when 'generate MP rest client' shows up in file explorer

https://code.visualstudio.com/docs/getstarted/keybindings#_contexts

IE. Does not make sense for the option to show up in a python project.


Start with the VS Code keybindings contexts documentation linked in the issue, then find the extension entry point that registers “generate MP rest client” in the file explorer. Confirm how the command is currently exposed and define the relevant project context; it is done when the option no longer appears in Python projects while remaining available for supported projects.

Written by the indexing model from the issue text.