Propagate maxDuration to edge adapter outputs (#95118)
## Summary
Propagate `maxDuration` to Edge adapter outputs so deployment adapters
receive the same route execution limit metadata as Node.js outputs.
Normalize Pages Router Edge adapter pathnames that end in `/index` to
their public route pathname, for example `/edge-pages/index` to
`/edge-pages`. This matters because the functions config manifest stores
route metadata under the public pathname, so matching the unnormalized
`/index` form would miss `maxDuration`.
Add adapter coverage for App Router pages and routes, Pages Router pages
and API routes, and both Node.js and Edge runtimes, including the Pages
Router `/index` normalization case.
## Verification
- `pnpm test-start-turbo
test/production/adapter-config/adapter-config.test.ts`
- `pnpm test-start-webpack
test/production/adapter-config/adapter-config.test.ts`
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