Implement GET test_runs API route

[sophia-huynh]

Proposed Changes

Implements GET for test_runs, allowing for API retrieval of information about the test runs for a group.

• GET /api/courses/:course_id/assignments/:assignment_id/groups/:id/test_runs returns the test runs for the given group for the given assignment. Returns all test runs and the associated test group result IDs.

Both JSON and XML can be returned depending on the Accept header.

Screenshots of your changes (if applicable)

n/a

Associated documentation repository pull request (if applicable)

https://github.com/MarkUsProject/Wiki/pull/271

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)
📖 Documentation update (change that updates documentation)
🔧 Internal (change that only affects developers or continuous integration)

Checklist

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Before opening your pull request:

• I have performed a self-review of my changes.
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• I have added tests for my changes, if applicable.
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Questions and Comments

N/A

[coveralls]

Coverage Report for CI Build 29352539665

Coverage increased (+1.4%) to 91.681%

Details

• Coverage increased (+1.4%) from the base build.
• Patch coverage: 99 of 99 lines across 3 files are fully covered (100%).
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	25110
Covered Lines:	23296
Line Coverage:	92.78%
Relevant Branches:	758
Covered Branches:	420
Branch Coverage:	55.41%
Branches in Coverage %:	Yes
Coverage Strength:	260.95 hits per line

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💛 - Coveralls

[Naragod]

LGTM

[sophia-huynh]

The aforementioned changes have been made (reverting formatting changes, changing to grouping.test_runs, returning the entire test group results rather than just the IDs), and moved the documentation changes into docs/docs/technical-guides/restful-api.md

[david-yz-liu]

Thanks @sophia-huynh!