Simple File Manager

[KesterTan]

Created a simple file manager that allows an instructor to manage the files and assessments in a course based on the simple file manager found here.

How Has This Been Tested?

• Tried adding a file, deleting a file and renaming
• Checked that paths and methods are only callable when you are an instructor of the course
• Check that the path changes whenever clicking a file or folder and it downloads/open the files when you opened
• Check that select all checkbox works as expected, creating folder works, upload multiple files works and deleting/renaming files work
• You should not be able to rename a file, upload a file, create a folder in the root directory
• Adding a file adds it to the courses directory and it actually appears
• Downloading a directory converts it to a tar file and recursively downloads everything in the directory
• Downloading a file downloads it

Types of changes

• 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:

• 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

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Walkthrough

The update introduces a comprehensive FileManager feature to a Rails application, enhancing the user interface with capabilities for managing files and folders. This includes browsing, uploading, downloading, renaming, and deleting files, along with secure permission handling based on user roles. The changes span across controller logic, views, stylesheets, JavaScript functionality, routing, and documentation, integrating a fully functional file manager into the application's interface and improving usability with a styled and interactive file management system.

Changes

File Path	Change Summary
app/controllers/file_manager_controller.rb	Added FileManagerController for file operations with permissions.
app/views/file_manager/index.html.erb	Introduced file manager interface for file operations.
app/views/file_manager/file.html.erb	Added view template for displaying file content.
app/assets/stylesheets/file_manager.scss	Added styles for the file manager interface.
app/assets/javascripts/file_manager.js	Introduced JavaScript functions for file management actions.
config/routes.rb	Added routes for file management actions.
spec/controllers/file_manager_controller_spec.rb	Added specs for FileManagerController.
app/views/layouts/_navbar.html.erb	Updated navbar links and syntax for readability and added "File Manager" link.
docs/instructors.md	Added "File Manager" section describing the feature's functionality.

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[KesterTan]

Can't think of a way to work around the codeQL issues. I feel like it has been addressed by checking if the path exists within the instructor paths but let me know what you think.

[KesterTan]

@coderabbitai pause

[damianhxy]

LGTM other than several nits

[damianhxy]

LGTM