Upgrade to jhipster 8..5 for curation platform

[zhx828]

In the recent effort to upgrade our node version to 20(oncokb/oncokb-transcript#286), we also upgraded our generator-jhipster to 8.3 as dependency. But we didn't do a proper jhipster upgrade including the backend changes.

The generator currently is not functional. I cannot generate new entity, so we have to prioritize the work.

This is the upgrade solution I have found that is doable using a brand new project as example:

1. npm install -g generator-jhipster@7.2.0
2. upgrade to 7.9.4 using jhipster upgrade --target-version 7.9.4
3. change node to v18
4. upgrade to 8.5.0 using jhipster-migrate.

jhipster-migrate as a blueprint seems to be the default upgrade method going forward. https://www.jhipster.tech/upgrading-an-application/#upgrading-from-jhipster-7-and-previous-versions

The reason it prevents us from upgrading is the mobx blueprint that we use only supporting v7.2.0. For the upgrade, we could remove the blueprint.