File manager exception fix

[KesterTan]

Description

This PR fixes the routing when a user is not allowed to access a path. This also adds unit tests which tests this functionality for this fix.

Resolves #2228

How Has This Been Tested?

• Create a course and assign a student to that course
• Navigate to that course in the file manager and copy the link
• Sign in as a student using dev login and try to access the link
• Note that you will not be able to see anything in that path and note the flash[:error]
• Run the new unit tests: rake spec SPEC=./spec/controllers/file_manager_controller_spec.rb and make sure that everything passes

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

📝 Walkthrough

📝 Walkthrough

Walkthrough

The changes in the pull request involve modifications to the FileManagerController to enhance error handling and authorization checks for file management actions. Key methods such as index, delete, rename, download_tar, and upload_file have been updated to include authorization checks, ensuring unauthorized users are redirected to the file manager index with an appropriate flash error message. Additionally, the test suite for the controller has been expanded to include shared examples for unauthorized access scenarios, improving coverage for various actions.

Changes

File	Change Summary
app/controllers/file_manager_controller.rb	Enhanced error handling and authorization checks in index, delete, rename, download_tar, and upload_file methods.
spec/controllers/file_manager_controller_spec.rb	Added shared examples for unauthorized access tests and modified existing tests for various actions to include authorization checks.

Assessment against linked issues

Objective	Addressed	Explanation
Ensure users are redirected to the index page if not authorized (2228)	✅
Prevent unauthorized access to file management actions (2228)	✅

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