[modeler] Allow QGIS interaction while running an algorithm in the modeler#62961

ValentinBuira wants to merge 16 commits intoqgis:masterqgis/QGIS:masterfrom

ValentinBuira:true-modal-alg-dialog-modelerValentinBuira/QGIS:true-modal-alg-dialog-modelerCopy head branch name to clipboard