feat: [DLCM-2108] avoid version file to be stored in browser cache and add date

Need solidify solidify/solidify-frontend!62 (merged)

https://issues.unige.ch/browse/DLCM-2107

https://issues.unige.ch/browse/DLCM-2108

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

src/app/components/presentationals/main-toolbar/main-toolbar-mobile/main-toolbar-mobile.presentational.ts

@@ -35,10 +35,7 @@ import {
 } from "@angular/core";
 import {AbstractMainToolbarPresentational} from "@app/components/presentationals/main-toolbar/abstract-main-toolbar/abstract-main-toolbar.presentational";
 import {AppUtil} from "@app/shared/utils/app.util";
-import {
-  AppVersion,
-  OAuth2Service,
-} from "solidify-frontend";
+import {AppVersion} from "solidify-frontend";
 
 @Component({
   selector: "dlcm-main-toolbar-mobile",