Override AggregateException.Message to include more detail
Override AggregateException.Message to include more detail

ToString() includes details on inner exceptions, but Message does not, with the default message just saying "One or more errors occurred."  This commit overrides Message to append the messages of the inner exceptions as well.

tijoytom/coreclr,JosephTremoulet/coreclr,Lucrecious/coreclr,naamunds/coreclr,stormleoxia/coreclr,sjsinju/coreclr,sagood/coreclr,wtgodbe/coreclr,mocsy/coreclr,sejongoh/coreclr,ragmani/coreclr,manu-silicon/coreclr,parjong/coreclr,schellap/coreclr,dasMulli/coreclr,Dmitry-Me/coreclr,mskvortsov/coreclr,JosephTremoulet/coreclr,mmitche/coreclr,roncain/coreclr,chuck-mitchell/coreclr,bartdesmet/coreclr,jhendrixMSFT/coreclr,ruben-ayrapetyan/coreclr,YongseopKim/coreclr,sejongoh/coreclr,cmckinsey/coreclr,mocsy/coreclr,hseok-oh/coreclr,Godin/coreclr,martinwoodward/coreclr,hseok-oh/coreclr,sjsinju/coreclr,poizan42/coreclr,krk/coreclr,ramarag/coreclr,dasMulli/coreclr,naamunds/coreclr,bartdesmet/coreclr,bartonjs/coreclr,russellhadley/coreclr,bartonjs/coreclr,manu-silicon/coreclr,James-Ko/coreclr,sejongoh/coreclr,russellhadley/coreclr,kyulee1/coreclr,JosephTremoulet/coreclr,wkchoy74/coreclr,wateret/coreclr,cydhaselton/coreclr,schellap/coreclr,poizan42/coreclr,swgillespie/coreclr,sperling/coreclr,benpye/coreclr,kyulee1/coreclr,Dmitry-Me/coreclr,chuck-mitchell/coreclr,sperling/coreclr,KrzysztofCwalina/coreclr,KrzysztofCwalina/coreclr,mocsy/coreclr,yeaicc/coreclr,krytarowski/coreclr,wtgodbe/coreclr,YongseopKim/coreclr,AlexGhiondea/coreclr,kyulee1/coreclr,roncain/coreclr,russellhadley/coreclr,qiudesong/coreclr,krk/coreclr,yeaicc/coreclr,yizhang82/coreclr,dasMulli/coreclr,cydhaselton/coreclr,russellhadley/coreclr,SlavaRa/coreclr,mocsy/coreclr,Lucrecious/coreclr,stormleoxia/coreclr,pgavlin/coreclr,Dmitry-Me/coreclr,roncain/coreclr,jhendrixMSFT/coreclr,Dmitry-Me/coreclr,James-Ko/coreclr,ZhichengZhu/coreclr,wateret/coreclr,dasMulli/coreclr,josteink/coreclr,cmckinsey/coreclr,jhendrixMSFT/coreclr,sagood/coreclr,KrzysztofCwalina/coreclr,martinwoodward/coreclr,sagood/coreclr,martinwoodward/coreclr,josteink/coreclr,shahid-pk/coreclr,jhendrixMSFT/coreclr,gkhanna79/coreclr,martinwoodward/coreclr,gkhanna79/coreclr,vinnyrom/coreclr,ruben-ayrapetyan/coreclr,shahid-pk/coreclr,LLITCHEV/coreclr,JonHanna/coreclr,sagood/coreclr,bartdesmet/coreclr,bartonjs/coreclr,LLITCHEV/coreclr,botaberg/coreclr,shahid-pk/coreclr,kyulee1/coreclr,cshung/coreclr,AlexGhiondea/coreclr,jamesqo/coreclr,James-Ko/coreclr,cydhaselton/coreclr,dpodder/coreclr,naamunds/coreclr,mokchhya/coreclr,parjong/coreclr,mmitche/coreclr,manu-silicon/coreclr,JosephTremoulet/coreclr,wateret/coreclr,wateret/coreclr,Godin/coreclr,jhendrixMSFT/coreclr,poizan42/coreclr,YongseopKim/coreclr,mokchhya/coreclr,LLITCHEV/coreclr,neurospeech/coreclr,shahid-pk/coreclr,yeaicc/coreclr,chuck-mitchell/coreclr,rartemev/coreclr,jamesqo/coreclr,alexperovich/coreclr,cmckinsey/coreclr,shahid-pk/coreclr,krk/coreclr,ragmani/coreclr,wkchoy74/coreclr,cshung/coreclr,yizhang82/coreclr,ZhichengZhu/coreclr,JonHanna/coreclr,Lucrecious/coreclr,alexperovich/coreclr,yeaicc/coreclr,cydhaselton/coreclr,martinwoodward/coreclr,cydhaselton/coreclr,vinnyrom/coreclr,vinnyrom/coreclr,neurospeech/coreclr,cmckinsey/coreclr,wkchoy74/coreclr,wkchoy74/coreclr,andschwa/coreclr,naamunds/coreclr,dasMulli/coreclr,yeaicc/coreclr,josteink/coreclr,parjong/coreclr,alexperovich/coreclr,gkhanna79/coreclr,andschwa/coreclr,wkchoy74/coreclr,James-Ko/coreclr,qiudesong/coreclr,wtgodbe/coreclr,mocsy/coreclr,botaberg/coreclr,neurospeech/coreclr,sagood/coreclr,Godin/coreclr,sejongoh/coreclr,mmitche/coreclr,wateret/coreclr,bartonjs/coreclr,chuck-mitchell/coreclr,bartonjs/coreclr,AlexGhiondea/coreclr,stormleoxia/coreclr,AlexGhiondea/coreclr,yizhang82/coreclr,botaberg/coreclr,ragmani/coreclr,schellap/coreclr,wateret/coreclr,dpodder/coreclr,JonHanna/coreclr,ZhichengZhu/coreclr,russellhadley/coreclr,vinnyrom/coreclr,jamesqo/coreclr,mokchhya/coreclr,mokchhya/coreclr,Dmitry-Me/coreclr,jamesqo/coreclr,sejongoh/coreclr,mskvortsov/coreclr,KrzysztofCwalina/coreclr,KrzysztofCwalina/coreclr,cshung/coreclr,josteink/coreclr,swgillespie/coreclr,mskvortsov/coreclr,benpye/coreclr,sjsinju/coreclr,rartemev/coreclr,benpye/coreclr,swgillespie/coreclr,krytarowski/coreclr,cshung/coreclr,KrzysztofCwalina/coreclr,parjong/coreclr,Godin/coreclr,neurospeech/coreclr,bartdesmet/coreclr,ragmani/coreclr,cmckinsey/coreclr,JosephTremoulet/coreclr,bartdesmet/coreclr,Godin/coreclr,mocsy/coreclr,Dmitry-Me/coreclr,tijoytom/coreclr,dpodder/coreclr,pgavlin/coreclr,sperling/coreclr,poizan42/coreclr,benpye/coreclr,qiudesong/coreclr,stormleoxia/coreclr,SlavaRa/coreclr,vinnyrom/coreclr,krk/coreclr,ZhichengZhu/coreclr,manu-silicon/coreclr,roncain/coreclr,mmitche/coreclr,YongseopKim/coreclr,tijoytom/coreclr,tijoytom/coreclr,yizhang82/coreclr,ramarag/coreclr,neurospeech/coreclr,krk/coreclr,sagood/coreclr,krytarowski/coreclr,andschwa/coreclr,bartonjs/coreclr,hseok-oh/coreclr,James-Ko/coreclr,pgavlin/coreclr,chuck-mitchell/coreclr,roncain/coreclr,stormleoxia/coreclr,stormleoxia/coreclr,SlavaRa/coreclr,alexperovich/coreclr,poizan42/coreclr,wtgodbe/coreclr,Lucrecious/coreclr,JonHanna/coreclr,cshung/coreclr,ramarag/coreclr,wtgodbe/coreclr,roncain/coreclr,tijoytom/coreclr,wtgodbe/coreclr,Godin/coreclr,ru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