(fix): handled partial download failure case

vscode/src/repository/http-utils.ts

@@ -67,6 +67,7 @@ export async function refreshAccessToken(refreshToken: string): Promise<string>
 
 
 export async function downloadFile(url: string, destinationPath: string, onProgress: (progress: number) => void): Promise<void> {
+    /// First download on a temp path. This prevents from converting partial downloaded files (due to interruption) into executables.
     const tempFilePath = `${destinationPath}.tmp`;
 
     const response = await axios({
@@ -97,5 +98,6 @@ export async function downloadFile(url: string, destinationPath: string, onProgr
         writer.on('finish', resolve);
         writer.on('error', reject);
     });
-    // Downloaded executable is saved as a temporory file. This will be renamed in the next session.
+    // Downloaded executable is saved as a pre-downloaded file which will be renamed in the next session.
+    fs.renameSync(tempFilePath, `${destinationPath}.pre-downloaded`);
 }

vscode/src/utilities/commanddash-integration/dart-cli-client.ts

@@ -26,7 +26,6 @@ async function setupExecutable(clientVersion: string, executablePath: string, ex
     return;
   }
   await downloadFile(response['url'], executablePath, onProgress);
-
 }
 
 export async function deleteExecutable(executablePath: string): Promise<void> {
@@ -118,7 +117,7 @@ export class DartCLIClient {
   public connect() {
     // Verify the presence of the temporary file, indicating a downloaded update during the last IDE session. 
     // Proceed with updating the executable if applicable.
-    const tempFilePath = `${this.executablePath}.tmp`;
+    const tempFilePath = `${this.executablePath}.pre-downloaded`;
     if (existsSync(tempFilePath)) {
       this.renameTempToExecutable(tempFilePath);
     }