feat: (Issue 8124) GitLab API to get system app info

Description

Use GitLab API to get system app update information.

Screenshots

Technical details

This MR is based on GitLab release APIs.

Tests

Issues

https://gitlab.e.foundation/e/backlog/-/issues/8124

10 commandments of code reviews

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Summary by CodeRabbit

• New Features

  • Introduced functionality for managing and retrieving system app updates.
  • Added support for fetching a list of eligible system apps from an external API.
  • Added capability to get detailed system app update information.

• Improvements

  • Enhanced system app data management with new data models and repository classes.