Fix design time build error causing incremental build issue #2036
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If during design time build, we fail to generate a projection, we don't delete the
rspfiles as we configured it to continue on error and thereby theOnErrorhandler doesn't run. This can cause for the incremental build to report it succeeded based onrspand inputs not changing when it hasn't. Fixing it by having a separate way to delete therspfile for design time builds. Given we want the non-design time build to still stop on error, keepingOnErrortoo.