Await finish of filestream so file is created for node16

packages/artifact/src/internal/download-http-client.ts

@@ -219,6 +219,14 @@ export class DownloadHttpClient {
       fileDownloadPath: string
     ): Promise<void> => {
       destinationStream.close()
+      // await until file is created at downloadpath
+      // wrap destinationStream's open event in promise 
+      await new Promise<void>(resolve => {
+        destinationStream.on('close', resolve)
+        if (destinationStream.writableFinished) {
+          resolve()
+        }
+      });
       await rmFile(fileDownloadPath)
       destinationStream = fs.createWriteStream(fileDownloadPath)
     }

packages/artifact/src/internal/utils.ts

@@ -270,15 +270,6 @@ export async function getFileSize(filePath: string): Promise<number> {
 }
 
 export async function rmFile(filePath: string): Promise<void> {
-  // TODO: find actual fix
-  // node 16 `CreateWriteStream` no longer creates a file
-  // download-http-client.ts#L151 no longer creates a file and we fail here
-  try {
-    await fs.stat(filePath)
-  } catch (e) {
-    // File does not exist
-    return
-  }
   await fs.unlink(filePath)
 }