Local dev build perf improvements

[marcpopMSFT]

I had copilot run some builds locally and analyze the binlogs.

Here were its suggestions. Recording just so this isn't lost. I think we could do more to limit what a local build does whether it's through filtering, limiting the build, not building the archives, etc.

#53607 came out of this.

Fix	Estimated Impact	Effort
Build with /p:TargetFramework=net11.0 for single-TFM inner loop	Eliminates DispatchToInnerBuilds (9.6 min cumulative saved)	None — just a flag
Use filtered solutions (cli.slnf, etc.) for focused work	Build only 9 projects instead of 184	None — already available
Skip code coverage (MsCoverageReferencedPathMaps) locally	~5 min cumulative saved	1 property
After initial build, use /p:BuildProjectReferences=false	Eliminates 42 min cumulative RPR walk	Flag + docs
Investigate MSBuild graph build (/graph)	Fundamentally faster project traversal	POC needed
Add Inputs/Outputs to redist layout targets	3.8 min → seconds for redist on no-op	~1 day

[marcpopMSFT]

CC @MichaelSimons for visibility on the analysis I had copilot do as we discussed the local dev experience.