Increase GCStress test timeouts. (#23576)
Increase GCStress test timeouts. (#23576)

New machines are slower that we had before, so increate the timeout for the longest runs.
cshung/coreclr,krk/coreclr,wtgodbe/coreclr,wtgodbe/coreclr,cshung/coreclr,wtgodbe/coreclr,poizan42/coreclr,wtgodbe/coreclr,cshung/coreclr,wtgodbe/coreclr,krk/coreclr,wtgodbe/coreclr,poizan42/coreclr,krk/coreclr,cshung/coreclr,poizan42/coreclr,poizan42/coreclr,poizan42/coreclr,krk/coreclr,cshung/coreclr,poizan42/coreclr,cshung/coreclr,krk/coreclr,krk/coreclr