Fixes: [AB#2014670](https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2014670)
### Description
A change was made in 8.0.2xx to register MSBuildSdkResolver for NGEN (#17732), against both devenv.exe and MSBuild.exe. Later a bug was found in the way MSBuild.exe loads the resolver so the change was reverted in 8.0.3xx (#19112). However, because the change had a measurable positive perf effect, the revert was effectively a regression for devenv.exe and got flagged so by PerfDDRITs.
This PR is a re-do of the original change, only this time with MSBuild.exe omitted, i.e. we're NGENing the resolver only for the default architecture of devenv.exe.
### Customer Impact
Startup perf regression, about 5% more methods JITted in scenarios measured by Visual Studio PerfDDRITs.
### Regression
Yes, perf regression in VS 17.10.
### Risk
Low
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