feat: (Issue 8124) New Origin and new Source for gitlab apps

Description

Introduce new Origin and new Source for gitlab apps

Screenshots

Technical details

Tests

Issues

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

10 commandments of code reviews

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Summary by CodeRabbit

• New Features

  • Added support for GitLab origin in various functionalities.
  • Introduced a new string resource "System app" for better localization.

• Refactor

  • Enhanced updateSource method to handle Origin cases more explicitly.

• Chores

  • Updated Origin and Source enum classes to include GITLAB.

• Incomplete Implementations

  • Placeholder comments for incomplete GitLab-related functionality in DownloadInfoApiImpl.kt and ApplicationListRVAdapter.kt.