Resolve "Variants removed from REPORT are re-added"

Description

See issue #197 (closed)

Related issues

Notes to review (code/docs/QA)

Removed test I believe doesn't make sense anymore and is leftover from previous implementations (we don't care whether assessment is outdated or not anymore).

QA: See #197 (closed), retry steps "to reproduce" and verify that it is no longer the case.

Tests

General

• Tests have been added that prove my fix is effective or that my feature works
• Related tests have been modified/removed

Hypothesis testing:

• Soak testing has been done
• Distribution between positive / negative cases has been checked

Database

• Includes changes to database schema
• Includes necessary database migrations

Configuration

• Includes changes to configuration
• Includes configuration migration instructions in documentation

Merge checklist

• Self-review of code has been performed.
• Feature review and validation against specification has been performed (if applicable). Apply label: QAdone
• Need for documentation has been evaluated and, if necessary, updated. Apply label: docsdone
• Code and implementation has been reviewed by other core developer (including any changes based on initial review). Apply label: code reviewdone

Closes #197 (closed)