ISSUE-7711: Add GET - api/.../groups/test_results api route

[Naragod]

Proposed Changes

We wish to give users the ability to obtain test results through the API. This PR adds the following endpoint: GET - /api/courses/:course_id/assignments/:assignment_id/groups/:id/test_results.

Screenshots of your changes (if applicable)

Associated documentation repository pull request (if applicable)

Type of Change

(Write an X or a brief description next to the type or types that best describe your changes.)

Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)	X
🐛 Bug fix (non-breaking change that fixes an issue)
🎨 User interface change (change to user interface; provide screenshots)
♻️ Refactoring (internal change to codebase, without changing functionality)
🚦 Test update (change that only adds or modifies tests)
📦 Dependency update (change that updates a dependency)
🔧 Internal (change that only affects developers or continuous integration)

Checklist

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• I have added tests for my changes, if applicable.
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Questions and Comments

This PR references:

• Wiki - Add GET - api/../groups/test_results endpoint documentation

[coveralls]

Pull Request Test Coverage Report for Build 20197513582

Details

• 99 of 99 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 91.53%

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Totals
Change from base Build 20079147506:	0.02%
Covered Lines:	43749
Relevant Lines:	46991

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💛 - Coveralls

[Naragod]

@david-yz-liu sounds good.

[david-yz-liu]

@Naragod oh yeah, I remembered that I had a similar conversation with one of my students a while ago, and some work in this direction is already present in #7599. This is a PR that I haven't yet had a chance to review but is on my radar.

[david-yz-liu]

Thanks, @Naragod!