Add a new upload function to the "Upload or Replace" action.

The "Upload or Replace" action is intended to replace the content of the selected source member.
It does not create a new source member when a local file with a different name is selected.
I would like a new source member upload function added to the "Upload or Replace" action.

Start by locating the VS Code extension's "Upload or Replace" action and tracing its existing replacement flow. The work is done when selecting a local file with a different name can create a new source member through that action, while the existing replacement behavior remains intact.

Written by the indexing model from the issue text.