Related to [this spectrum post](https://spectrum.chat/next-js/general/next-8-minor-update-breaks-dynamic-import-in-jest-tests~1e7b58e7-e301-4ef9-9de4-eef6ed3639d4).

I'm not removing the `babel-plugin-dynamic-import-node` package as it's going to be used by #7016

* Use next.config env and packages to calculate
hashes for chunk-graph

* Remove example from testing

* remove left over import

* Tweak behavior

* Add Flying Shuttle v1

* Add serverless file restoration

* Add another message

* Update test

* Resolve page version last

* Print number of changed pages

* Remove old tests

* Re-add head build ID writing

* Change syntax appearance

* Start adding test components

* Fix react loadable manifest

* Complicate dynamic testing

* Fix first build missing head build id

* Remove flying shuttle tests

* Brought escape-string-regexp source to next

* Added Copyright comment

Closes #6939 

* Temporarily only do one pass

* Add types

* Generate two versions of pages

* Add code VSCode deleted

* Add dynamicBuildId option to __NEXT_DATA__

* Reduce amount of diff

* Make getPageFile code easier to read

* Minimize diff

* minimize diff

* Fix default value for dynamicBuildId

* Fix weird bug

* Fetch the head build id on client

* Move __selectivePageBuilding

* Add tests

* Remove _this

* Add console warning