Hide deactivated/missing students and restore re-enrolled students during roster sync

[donny-wong]

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.)

The roster_sync process ensures that student visibility in MarkUs remains synchronized with Canvas enrollment. Students deactivated or removed in Canvas are automatically hidden in MarkUs, while re-enrolled students are restored to active status.

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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)
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🚦 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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