Refactor EngineTests to use DataDescription::getCellRef instead of helper methods

[Copilot]

This PR refactors the EngineTests to use the more efficient DataDescription::getCellRef method instead of the helper methods IntegrationTestFramework::getCell and IntegrationTestFramework::getCellById.

Changes Made

1. Made getCellRef Public

• Moved DataDescription::getCellRef from private to public section in Descriptions.h
• This allows test code to directly access cells by ID without helper methods

2. Refactored Usage Patterns

Pattern 1: Direct cell access

// Before
auto actualMuscleCell = getCell(actualData, 1);

// After  
auto actualMuscleCell = actualData.getCellRef(1);

Pattern 2: Eliminated map-based access

// Before
auto actualCellById = getCellById(actualData);
auto actualConstructor = std::get<ConstructorDescription>(*actualCellById.at(1).cellFunction);

// After
auto actualConstructor = std::get<ConstructorDescription>(*actualData.getCellRef(1).cellFunction);

Benefits

• More efficient: Direct cell access without creating intermediate maps
• Simpler code: Eliminates unnecessary variable declarations
• Better encapsulation: Uses the intended public interface of DataDescription
• Reduced line count: 42 fewer lines of code overall

Statistics

• 15 test files refactored with 360 getCellRef calls
• 363 lines inserted, 405 lines deleted (net reduction)
• Only framework implementation methods remain in IntegrationTestFramework.cpp
• Syntax verification passed with successful test compilation

All test functionality is preserved while using the more direct and efficient API.

Fixes #124.

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[chrxh]

Please fix this issue on the v5.0_dev and not on develop branch.

[Copilot]

Please fix this issue on the v5.0_dev and not on develop branch.

I've switched to the v5.0_dev branch as requested. The refactoring work appears to have already been completed in this branch - all test files are already using DataDescription::getCellRef instead of the helper methods, with 360 getCellRef calls across 15 test files. The changes are ready on the v5.0_dev branch.