Prepar Project for an angular version update to version 17

Related issues

Addresses #104 (closed)

Acceptance criteria

• Implemented code changes don't diverge from the related issue.
• Version number is incremented according to SemVer. (Snapshot versions are not merged/released.)
• Only released versions of dependencies are used (i.e. no snapshot versions).
• Pipeline still works.
• GitLab issue is up-to-date.

If necessary, the following sections have been updated:

• Readme.md

Proposed squash commit message

Prepare Frontend for an Angular Update to version 17

• Remove protractor as this reached end of life in August 2023.
• Remove e2e - Therefore protractor had been used.
• Remove fontsource dependencies for roboto font and material-icons
• Remove flex layout dependency and its usage - flexlayout is outdated sind mid 2022.
• Replace flex layout usage by custom css styles in file styles.css.
• Remove jsonforms dependencies (jsonforms/angular, jsonforms/angular-material, jsonforms/core) as they are outdated.
• Replace jsonforms with native typescript / angular json handling.
• Remove any usage of these dependencies.
• Add font directly as an third party asset
• Add native material-icon dependency
• Remove env.js entry from index.html, as the index.html does not need that entry.
• Remove prettier from eslint settings, replace by pure eslint settings.
• Update all files within /src/scss directory that are defining the style and layout. All changes are arcoding to the current (as of 2024) styleguide.
• Add Angular default eslint configuration - remove former adjusted version.
• Add a new model qrcode.ts that describes the qrcode data model.
• Fix several tests, add missing modules to test configuration.
• Change methodenames in ThemeServiceStub in service-stubs.ts due to former changes of theme.service.ts.