Local dev build perf improvements

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