Resolve "Import From Artemis: Meta Data Page Improvements"

Related to #595 (closed)

Summary by CodeRabbit

• New Features

  • Help tooltips for Title and Description on the exercise import form.
  • Inline display of creator/publisher validation errors during import.
  • Import now maps incoming "problemStatement" to the exercise description.
  • Hid the “Optional Attributes” identifiers section from the import UI.

• Documentation

  • Added help text for exercise title and description (EN/DE).
  • Refined German wording for “Creators and publishers are identical.”
  • Adjusted GitLab modal cancel wording (EN/DE).

• Chores

  • Enabled automated high-level review workflow via configuration.