Release 3261

Trello card

https://trello.com/c/V2PCc0U6/6340-upgrade-shakapacker-from-7-to-8-on-get-school-experience?filter=member:spencerldixon

Context

Shakapacker needs to be upgraded to v8 inline with the Get Into Teaching website

Changes proposed in this pull request

• Update shakapacker to v8.0.1
• Configure packageManager as per new requirements

Guidance to review