feat: improve turbopack compatibility (#11376)

This PR introduces a few changes to improve turbopack compatibility and
ensure e2e tests pass with turbopack enabled

## Changes to improve turbopack compatibility
- Use correct sideEffects configuration to fix scss issues
- Import scss directly instead of duplicating our scss rules
- Fix some scss rules that are not supported by turbopack
- Bump Next.js and all other dependencies used to build payload

## Changes to get tests to pass

For an unknown reason, flaky tests flake a lot more often in turbopack.
This PR does the following to get them to pass:
- add more `wait`s
- fix actual flakes by ensuring previous operations are properly awaited

## Blocking turbopack bugs
- [X] https://github.com/vercel/next.js/issues/76464
  - Fix PR: https://github.com/vercel/next.js/pull/76545
  - Once fixed: change `"sideEffectsDisabled":` back to `"sideEffects":`
  
## Non-blocking turbopack bugs
- [ ] https://github.com/vercel/next.js/issues/76956

## Related PRs

https://github.com/payloadcms/payload/pull/12653
https://github.com/payloadcms/payload/pull/12652