Enable to fetch application description information on adding app

[khanhtc1202]

What would you like to be added:

Currently, on adding application (via suggestion or manual) we don't fetch the application spec.description information in app.pipecd.yaml file. So, even we have prepared spec.description value in application configuration file, that value will not be reflected on the web console until we make other changes on app.pipecd.yaml to trigger piped_api.UpdateApplicationConfigurations.

Why is this needed:

[niladrix719]

hey would love to give it a try