upgrade webpack to shakapacker

[abdellani]

What? Why?

• Closes #10298

https://github.com/shakacode/shakapacker/blob/main/docs/v6_upgrade.md

What should we test?

• Visit ... page.

Release notes

Changelog Category (reviewers may add a label for the release notes):

• [ ] User facing changes
• [ ] API changes (V0, V1, DFC or Webhook)
• [ ] Technical changes only
• [ ] Feature toggled

The title of the pull request will be included in the release notes.

Dependencies

Documentation updates