C#: Cleanup expanded assignments.#21452

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michaelnebel wants to merge 12 commits intogithub:mainfrom

michaelnebel:csharp/expandedassignment

Commits on Mar 11, 2026

C#: Extract compound operator assignments as is.
michaelnebel
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Commits on Mar 12, 2026

C#: Update the DB Scheme such that compound assignments can be considered operator calls.
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C#: Let assign operations be operator calls.
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C#: Add another group of assignable definitions (corresponding to compound assignment operations) and update taint flow for +.
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C#: Remove uses of expanded assignment.
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C#: Remove expanded assignments from tests.
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C#: Remove Primary QL class and toString for DynamicOperatorCall (fix issues with inheritance hierarchy as AssignOperation now extends OperatorCall).
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C#: Update cs/useless-assignment-to-local to take AssignOperationDefinitions into account.
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C#: Update MissingXMLValidation expected test output. Note that this removes a duplicate result.
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C#: Update test expected output.
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[TODO]: Only partial solution to range analysis.
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C#: Cater for the dynamic member access call special case.
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