fix: rework file handling so we always explicitly create, overwrite or both (#12812)

server/test/repositories/storage.repository.mock.ts

@@ -48,7 +48,9 @@ export const newStorageRepositoryMock = (reset = true): Mocked<IStorageRepositor
     createZipStream: vitest.fn(),
     createReadStream: vitest.fn(),
     readFile: vitest.fn(),
-    writeFile: vitest.fn(),
+    createFile: vitest.fn(),
+    createOrOverwriteFile: vitest.fn(),
+    overwriteFile: vitest.fn(),
     unlink: vitest.fn(),
     unlinkDir: vitest.fn().mockResolvedValue(true),
     removeEmptyDirs: vitest.fn(),