Merge pull request #21916 from mantidproject/21843_engggui_refine_in_separate_thread

...ythonInterface/plugins/algorithms/GSASIIRefineFitPeaks.py

docs/source/release/v3.13.0/diffraction.rst

qt/scientific_interfaces/EnggDiffraction/CMakeLists.txt

...c_interfaces/EnggDiffraction/EnggDiffGSASFittingModel.cpp

...fic_interfaces/EnggDiffraction/EnggDiffGSASFittingModel.h

...terfaces/EnggDiffraction/EnggDiffGSASFittingPresenter.cpp

...interfaces/EnggDiffraction/EnggDiffGSASFittingPresenter.h

...faces/EnggDiffraction/EnggDiffGSASFittingViewQtWidget.cpp

...erfaces/EnggDiffraction/EnggDiffGSASFittingViewQtWidget.h

..._interfaces/EnggDiffraction/EnggDiffGSASFittingWorker.cpp

...ic_interfaces/EnggDiffraction/EnggDiffGSASFittingWorker.h

...faces/EnggDiffraction/EnggDiffMultiRunFittingQtWidget.cpp

...erfaces/EnggDiffraction/EnggDiffMultiRunFittingQtWidget.h

.../EnggDiffraction/GSASIIRefineFitPeaksOutputProperties.cpp

...es/EnggDiffraction/GSASIIRefineFitPeaksOutputProperties.h

...ic_interfaces/EnggDiffraction/IEnggDiffFittingPresenter.h

...ic_interfaces/EnggDiffraction/IEnggDiffGSASFittingModel.h

...interfaces/EnggDiffraction/IEnggDiffGSASFittingObserver.h

...nterfaces/EnggDiffraction/IEnggDiffGSASFittingPresenter.h

...fic_interfaces/EnggDiffraction/IEnggDiffGSASFittingView.h