Renaming in new WorkspaceEdit api

[gushuro]

Testing #42334

When renaming from.txt -> to.txt using the new api, if to.txt already exists, nothing happens.
I'd expect the other file to be overwritten, though it would also make sense to leave it as it is and make renameResource to return some value that represents that the renaming didn't happen.

[gushuro]

Another problem I found was renaming and then modifying the new file.

For example:

let we = new vscode.WorkspaceEdit();
we.renameResource(currentUri, newUri);
we.insert(newUri, position, "InsertText");
vscode.workspace.applyEdit(we);

Does the rename but doesn't insert the text in the new file.

Creating a new WorkspaceEdit doesn't work as expected either

let we = new vscode.WorkspaceEdit();
we.renameResource(currentUri, newUri);
vscode.workspace.applyEdit(we);

let we2 = new vscode.WorkspaceEdit();
we2.insert(newUri, position, "InsertText");
vscode.workspace.applyEdit(we2);

[vscodebot]

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