Misc Changes

• Revert "Remove legacy PPR codepaths": #95113
• dev-overlay: wire Link prefetch= Partial Prefetching warning into Insights: #94798
• Docs/partial prefetching: #94855
• [ci] Make preview tarballs available while new Canaries are being published: #95112
• [cd] add ad-hoc preview release cut from canary: #95086
• Add missing switch case: #95127
• Revert "Add missing switch case": #95129
• Fix Navigation Inspector styles in dark mode: #95126
• [test] Reorder hmr-intercept-routes test to avoid a reload/refresh race: #95134

Credits

Huge thanks to @eps1lon, @aurorascharff, @icyJoseph, @unstubbable, and @samselikoff for helping!