Separate courses into Current and Past sections in Student view

[freyazjiner]

Proposed Changes

(Describe your changes here. Also describe the motivation for your changes: what problem do they solve, or how do they improve the application or codebase? If this pull request fixes an open issue, use a keyword to link this pull request to the issue.)
This pull request addresses issue #7729 by updating the MarkUs student view homepage to separate courses into two groups: Current Courses and Past Courses.

Since courses cannot be grouped by semester, the distinction is made by comparing each course’s end_at date with the current date:

• Courses whose end date is in the future are shown under Current Courses.
• Courses whose end date is in the past are shown under Past Courses.
• If a group has no courses, its section title is not rendered.

Screenshots of your changes (if applicable)

instructor's view: student's view with both current courses and past courses: student's view with current courses but no past courses:

Associated documentation repository pull request (if applicable)

Type of Change

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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)

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Questions and Comments

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[coveralls]

Pull Request Test Coverage Report for Build 21343401390

Details

• 12 of 12 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.003%) to 91.651%

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Totals
Change from base Build 21339519388:	0.003%
Covered Lines:	44357
Relevant Lines:	47589

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💛 - Coveralls