Desktop: Add File > Save As… (#3034)

* Make file name and document name identical

* Add save as action

* Fix test errors

* Add missing save as action

* Desktop fix drop file open document file message

* Address review comments

* Replace file save suffix with file extension

* Add comment specifying that the upload function takes a html input accept string

* Fix remove file extension in web

* Use let

* Don't show save as menu entry in web

* Don't add SaveDocumentAs in web

* Remove file extension on all open document file calls

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Co-authored-by: Dennis Kobert <dennis@kobert.dev>

editor/src/dispatcher.rs

@@ -497,7 +497,8 @@ mod test {
 			);
 
 			let responses = editor.editor.handle_message(PortfolioMessage::OpenDocumentFile {
-				document_name: document_name.into(),
+				document_name: Some(document_name.to_string()),
+				document_path: None,
 				document_serialized_content,
 			});