Remove addScratchpadToEachArea function

[flomnes]

Initialize runtime infos which already prepares per-area scratchpads StudyRuntimeInfos::loadFromStudy creates the per-numspace scratchpad.

Avoid possible memory violations

unknown location(0): fatal error: in "ONE_AREA__ONE_THERMAL_CLUSTER/parallel2": memory access violation at address: 0x10: no mapping at fault address
/home/runner/work/Antares_Simulator/Antares_Simulator/src/tests/end-to-end/simple_study/simple-study.cpp(240): last checkpoint: "parallel2" test entry

https://github.com/AntaresSimulatorTeam/Antares_Simulator/actions/runs/23195374391/job/67402200831?pr=3497

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud