Make copynative use nested msbuild out-of-proc executions #62404
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I recently noticed that the copynative step often takes an
excessive amount of time (up to 20 minutes). I tracked this down
to a deficiency caused by my summer cleanup of the test build
scripts - in the copynative step we should also use out-of-proc
msbuild executions for the individual test groups otherwise msbuild
chokes on the huge number of properties and slows down dramatically.
Thanks
Tomas