(test) O3-5000 : Added unit tests for Translation Builder

[Bharath-K-Shetty]

Requirements

• This PR has a title that briefly describes the work done including the ticket number. If there is a ticket, make sure your PR title includes a conventional commit label. See existing PR titles for inspiration.
• My work conforms to the OpenMRS 3.0 Styleguide and design documentation.
• My work includes tests or is validated by existing tests.

Summary

This PR adds unit tests to improve reliability and ensure correct behavior of the Translation Builder.

Key Test Coverage:

• Rendering: Verify Translation Builder UI renders with schema (tabs, dropdown, buttons, search).

• Translations Display: Confirm fallback and overridden translations appear correctly.

• Editing: Validate EditTranslationModal opens, updates schema on save, and cancels without changes.

• Filtering & Search: Ensure tabs (All/Translated/Untranslated) and search filtering work.

• Language Switching: Confirm translations update when switching languages, including backend merge.

• Download: Test translation download, with error handling when no translations exist.

• Upload: Mock upload flow with success and failure cases, showing proper snackbar messages.

Screenshots

Related Issue

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