TAs See Starter Files

[pranavrao145]

Motivation and Context

Closes #5137. If an assignment has several starter file groups, there is a possibility that different students can have different starter files. However the grading TA cannot currently see information about starter files, so they cannot tell which files are assigned to whom. This PR aims to fix this.

Your Changes

• Change Rails policies to allow TAs to access starter-file-related routes.
• Add a "read-only" mode to the assignment starter file page, which TAs will see if they do not have permission to edit. This includes permission to download starter file mappings, which they can use to see who is assigned what starter file.

Type of change (select all that apply):

• New feature (non-breaking change which adds functionality)

Testing

• Changed existing RSpec policy tests for routes that were changed.
• Wrote a suite of Jest tests to test the behaviour of the disabling/enabling of buttons on readOnly mode for the Starter File page.

Checklist

• I have performed a self-review of my own code.
• I have verified that the pre-commit.ci checks have passed.
• I have verified that the CI tests have passed.
• I have reviewed the test coverage changes reported on Coveralls.
• I have added tests for my changes.
• I have updated the Changelog.md file.
• I have made changes to the documentation and linked to that pull request below.

Pull request to make documentation changes (if applicable)

MarkUsProject/Wiki#207

[coveralls]

Pull Request Test Coverage Report for Build 8493244503

Details

• 52 of 52 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 91.849%

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Totals
Change from base Build 8487186587:	-0.1%
Covered Lines:	40082
Relevant Lines:	42992

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💛 - Coveralls