feat(codemod): add logic for major version bump (#8260)
### Description
Add migration logic for the 1->2 move.
For the major bump we run all existing transforms that are safe to be
run twice to ensure that `turbo.json` is in the desired state.
A few things to note:
- We change the introduction version for the 2.0 codemods to the canary
to allow for easier testing
- I updated `migrate-dot-env` to work with either `pipeline` or `tasks`
as there isn't a great way to order transforms that are introduced in
the same version.
- Add an idempotent flag to transformers that defaults to `true`. This
is used to mark a transformation as one to avoid re-running.
### Testing Instructions
Added unit test for major version migration.
Manual testing on repos via `turbo build --filter='@turbo/codemod'` and
then using `node ~/code/turbo/packages/turbo-codemod/dist/cli.js migrate
--to 2.0.0-canary.0` (canary is necessary due to 2.0.0 not existing in
npm yet).
