C++: Remove deprecated code deprecated more than a year ago

[jketema]

Not need to run DCA on this; just piggy backing some DCA on this PR to test something.

[Copilot]

Pull request overview

Removes long-deprecated C++ CodeQL modeling interfaces (ThrowingFunction and NonThrowingFunction) and adds a breaking change note documenting the migration paths.

Changes:

• Removed deprecated ThrowingFunction interface from Throwing.qll.
• Removed deprecated NonThrowingFunction alias from NonThrowing.qll.
• Added a breaking change note describing the removals and replacements.

Show a summary per file

File	Description
cpp/ql/lib/semmle/code/cpp/models/interfaces/Throwing.qll	Removes deprecated ThrowingFunction API.
cpp/ql/lib/semmle/code/cpp/models/interfaces/NonThrowing.qll	Removes deprecated NonThrowingFunction alias.
cpp/ql/lib/change-notes/2026-04-14-throwing.md	Documents the breaking removals and migration targets.

Copilot's findings

Comments suppressed due to low confidence (1)

cpp/ql/lib/semmle/code/cpp/models/interfaces/Throwing.qll:16

• The module-level documentation at the top of this file still instructs users to extend ThrowingFunction, but ThrowingFunction is removed in this PR. Please update the header comment to reference the current API (likely AlwaysSehThrowingFunction) and adjust the description accordingly so it no longer claims to model generic “may throw” behavior if the module now only exposes SEH-throwing behavior.

/**
 * A function that unconditionally raises a structured exception handling (SEH) exception.
 */
abstract class AlwaysSehThrowingFunction extends Function { }

• Files reviewed: 3/3 changed files
• Comments generated: 0

[tausbn]

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