feat: [DLCM-2044] display changelog into update dialog

https://issues.unige.ch/browse/DLCM-2044

Need solidify solidify/solidify-frontend!69 (merged)

To test the dev, simulate a release process by :

1. run command npm run prepare-release 2.1.0
2. add this in the constructor of app.component.ts DialogUtil.open(this._dialog, UpdateVersionDialog); to force update dialog to be displayed

Warning : Do not merge this branch before release solidify and increment solidify version in package json

Reminder : Procedure to test solidify frontend branch

1. Pull dlcm and solidify branches
2. npm i on solidify (allow to retrieve required lib)
3. npm i on dlcm (allow to retrieve required lib)
4. npm run build-solidify on dlcm (allow to override solidify lib from nexus with local build)
5. npm run start on dlcm to run the app