Assessment test fixes

[KesterTan]

Fixes assessment specs

• Removed flash error since we are not flashing an error anywhere when the file is not valid
• Changed naming of display name in anticipation of #2102

How Has This Been Tested?

• Without #2102 merged, there should be one error in tests
• With #2102 merged, there should be no errors

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have run rubocop and erblint for style check. If you haven't, run overcommit --install && overcommit --sign to use pre-commit hook for linting
• [ ] My change requires a change to the documentation, which is located at Autolab Docs
• [ ] I have updated the documentation accordingly, included in this PR

[coderabbitai[bot]]

Walkthrough

## Walkthrough The recent update introduces a comprehensive File Manager feature to a Rails application, enhancing file operations like browsing, uploading, downloading, renaming, and deleting files and folders within a directory structure. It incorporates front-end adjustments for a user-friendly interface, back-end controller logic for managing file operations securely, and tests to ensure functionality aligns with different user roles. Additionally, it integrates a navigation link for easy access and documents the feature for instructors, streamlining file management within the application. ## Changes | File Path | Change Summary | |--------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------| | app/assets/javascripts/.../file_manager.js | Introduced functions for file operations (rename, delete, download, upload, create folders) and managing selections via AJAX. | | app/assets/stylesheets/.../file_manager.scss | Added styling for the file manager interface (layout, checkboxes, table alignment, scrolling, button styling). | | app/controllers/.../file_manager_controller.rb | Implemented controller logic for browsing, uploading, downloading, renaming, deleting files/folders, and enforcing permissions. | | app/views/file_manager/file.html.erb
app/views/file_manager/index.html.erb | Added view templates for displaying file content and the File Manager interface with file/folder operations. | | app/views/layouts/.../_navbar.html.erb | Added a "File Manager" link in the navigation bar. | | config/routes.rb | Added routes for file manager operations and updated other routes. | | docs/instructors.md | Documented the File Manager feature for instructors. | | spec/controllers/.../file_manager_controller_spec.rb | Introduced specs for FileManagerController, testing rendering and functionality based on user roles. | | spec/features/assessment_spec.rb | Updated test variable and removed an expectation related to handout validation. | This table summarizes the changes in a concise manner, grouping similar file changes and using ellipsis to shorten long paths.

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