fix: app subprocess restart on error and better reporting (#35284)

.changeset/giant-nails-trade.md

.changeset/honest-kings-allow.md

.changeset/quiet-radios-fry.md

.changeset/young-dots-cheat.md

packages/apps-engine/deno-runtime/handlers/app/handler.ts

packages/apps-engine/deno-runtime/lib/messenger.ts

...s-engine/src/server/runtime/deno/AppsEngineDenoRuntime.ts

...es/apps-engine/src/server/runtime/deno/LivenessManager.ts

...s/apps-engine/src/server/runtime/deno/ProcessMessenger.ts