[v11] Migrate cookie / requestData gating to dataCollection

[chargome]

Two server SDKs still gate request-data/cookie collection on `sendDefaultPii` via transitional shims. The [spec](https://develop.sentry.dev/sdk/foundations/client/data-collection/#default-collection-behavior) defines `cookies` (and headers/query) defaulting to `{ mode: "denyList" }` — collected, denylist-filtered, **not** gated on `sendDefaultPii`. In v11 these shims should be removed so collection is driven purely by resolved `dataCollection`.

- cloudflare
- vercel-edge

[linear-code]

JS-2650