Index route for feedback

[loiswells97]

Status

• closes https://github.com/RaspberryPiFoundation/digital-editor-issues/issues/979

What's changed?

• Added index route for project feedback

[Copilot]

Pull Request Overview

This PR adds functionality to list feedback on a project by introducing an index route for project feedback. The change enables teachers and students to retrieve all feedback associated with a specific project.

• Added index action to the feedback controller with authorization checks
• Updated routes to support both index and create actions for feedback resources
• Added comprehensive test coverage for listing feedback with different user roles

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
config/routes.rb	Changed feedback from singular resource to plural resources to support index action
app/controllers/api/feedback_controller.rb	Added index action to retrieve and authorize feedback for a project
app/views/api/feedback/index.json.jbuilder	Created view template to render feedback list as JSON
app/models/ability.rb	Updated authorization rules to allow reading feedback for teachers and students
spec/models/ability_spec.rb	Added test cases verifying read permissions for feedback
spec/features/feedback/listing_feedback_spec.rb	Added comprehensive integration tests for listing feedback endpoint

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[danhalson]

Just added a couple of things, I think the copilot suggestions are also worth looking at, I commented on one, but also the one about redundant authorization just in case of n+1s

[danhalson]

LGTM