Re-indexing assets from packages is not triggered automatically at startup

Steps to reproduce:

1. Create a new project using 6.3.X (official build)
2. Enable the packages indexing in the preferences
3. Let the indexing process complete
4. Close the editor and reopen it using 6.5.0a7 or more recent
5. Check that there is not indexing process triggered after startup
6. Open the ShaderGraph template window (Create->Shader Graph->From Template...)

Actual result: The window is empty and the indexing process is started. As soon as the indexing process is completed, the template window is correctly populated.

Expected result: The indexing process is automatically started as early as possible after the editor starts.{}