Updating tests/runtest.cmd to use delayed expansion for instances of `_msbuildexe`
Updating tests/runtest.cmd to use delayed expansion for instances of `_msbuildexe`

yeaicc/coreclr,tijoytom/coreclr,krk/coreclr,mskvortsov/coreclr,dpodder/coreclr,yeaicc/coreclr,ragmani/coreclr,cmckinsey/coreclr,krk/coreclr,mmitche/coreclr,yeaicc/coreclr,yizhang82/coreclr,ragmani/coreclr,poizan42/coreclr,russellhadley/coreclr,sagood/coreclr,yizhang82/coreclr,AlexGhiondea/coreclr,cydhaselton/coreclr,qiudesong/coreclr,cshung/coreclr,tijoytom/coreclr,James-Ko/coreclr,YongseopKim/coreclr,rartemev/coreclr,mskvortsov/coreclr,cshung/coreclr,ruben-ayrapetyan/coreclr,gkhanna79/coreclr,pgavlin/coreclr,ruben-ayrapetyan/coreclr,ruben-ayrapetyan/coreclr,cydhaselton/coreclr,cshung/coreclr,krk/coreclr,dpodder/coreclr,parjong/coreclr,wtgodbe/coreclr,alexperovich/coreclr,botaberg/coreclr,JonHanna/coreclr,botaberg/coreclr,hseok-oh/coreclr,ruben-ayrapetyan/coreclr,kyulee1/coreclr,JosephTremoulet/coreclr,krk/coreclr,mmitche/coreclr,russellhadley/coreclr,hseok-oh/coreclr,pgavlin/coreclr,yeaicc/coreclr,wtgodbe/coreclr,dpodder/coreclr,JonHanna/coreclr,wtgodbe/coreclr,russellhadley/coreclr,rartemev/coreclr,cmckinsey/coreclr,botaberg/coreclr,cydhaselton/coreclr,parjong/coreclr,jamesqo/coreclr,yizhang82/coreclr,James-Ko/coreclr,mmitche/coreclr,JosephTremoulet/coreclr,parjong/coreclr,parjong/coreclr,AlexGhiondea/coreclr,jamesqo/coreclr,alexperovich/coreclr,parjong/coreclr,kyulee1/coreclr,hseok-oh/coreclr,kyulee1/coreclr,JonHanna/coreclr,tijoytom/coreclr,gkhanna79/coreclr,wateret/coreclr,mmitche/coreclr,poizan42/coreclr,wtgodbe/coreclr,JosephTremoulet/coreclr,wtgodbe/coreclr,russellhadley/coreclr,yeaicc/coreclr,mskvortsov/coreclr,krytarowski/coreclr,jamesqo/coreclr,yeaicc/coreclr,krytarowski/coreclr,botaberg/coreclr,ragmani/coreclr,AlexGhiondea/coreclr,YongseopKim/coreclr,dpodder/coreclr,mskvortsov/coreclr,cydhaselton/coreclr,cydhaselton/coreclr,YongseopKim/coreclr,yizhang82/coreclr,qiudesong/coreclr,qiudesong/coreclr,cmckinsey/coreclr,sagood/coreclr,YongseopKim/coreclr,YongseopKim/coreclr,jamesqo/coreclr,krytarowski/coreclr,cshung/coreclr,pgavlin/coreclr,krk/coreclr,rartemev/coreclr,poizan42/coreclr,cmckinsey/coreclr,ruben-ayrapetyan/coreclr,wateret/coreclr,James-Ko/coreclr,krytarowski/coreclr,wateret/coreclr,cydhaselton/coreclr,alexperovich/coreclr,rartemev/coreclr,AlexGhiondea/coreclr,gkhanna79/coreclr,ragmani/coreclr,qiudesong/coreclr,AlexGhiondea/coreclr,kyulee1/coreclr,sagood/coreclr,JonHanna/coreclr,botaberg/coreclr,yizhang82/coreclr,poizan42/coreclr,James-Ko/coreclr,AlexGhiondea/coreclr,JosephTremoulet/coreclr,poizan42/coreclr,qiudesong/coreclr,tijoytom/coreclr,yizhang82/coreclr,hseok-oh/coreclr,wateret/coreclr,gkhanna79/coreclr,russellhadley/coreclr,cshung/coreclr,mskvortsov/coreclr,tijoytom/coreclr,alexperovich/coreclr,jamesqo/coreclr,alexperovich/coreclr,rartemev/coreclr,parjong/coreclr,hseok-oh/coreclr,ragmani/coreclr,James-Ko/coreclr,krytarowski/coreclr,tijoytom/coreclr,jamesqo/coreclr,mmitche/coreclr,pgavlin/coreclr,krytarowski/coreclr,wtgodbe/coreclr,mskvortsov/coreclr,JonHanna/coreclr,JosephTremoulet/coreclr,cmckinsey/coreclr,rartemev/coreclr,alexperovich/coreclr,dpodder/coreclr,gkhanna79/coreclr,ragmani/coreclr,qiudesong/coreclr,sagood/coreclr,JosephTremoulet/coreclr,James-Ko/coreclr,cmckinsey/coreclr,mmitche/coreclr,kyulee1/coreclr,wateret/coreclr,wateret/coreclr,botaberg/coreclr,JonHanna/coreclr,poizan42/coreclr,sagood/coreclr,cshung/coreclr,kyulee1/coreclr,yeaicc/coreclr,cmckinsey/coreclr,russellhadley/coreclr,dpodder/coreclr,pgavlin/coreclr,krk/coreclr,pgavlin/coreclr,gkhanna79/coreclr,hseok-oh/coreclr,ruben-ayrapetyan/coreclr,YongseopKim/coreclr,sagood/coreclr