feat: add `deploymentId` config (#63198)
This PR stabilizes an experimental feature that was added in a previous
PR https://github.com/vercel/next.js/pull/50470
It allows the user to set `deploymentId` in `next.config.js`, which is a
unique identifier for a deployment that will be included in each
request's query string or header.
This PR is easier to review with whitespace hidden:
https://github.com/vercel/next.js/pull/63198/files?w=1
Closes NEXT-2789
