[Cashtab-components] Upgrade to webpack 5

Summary:
T2678

Resolve dependabot issues

In this case, the latest version of webpack was required, so webpack migration and storybook upgrades are performed in this diff

Test Plan:
npm run build and no errors
npm run storybook and button components still work with cashtab extension

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Subscribers: emack

Differential Revision: https://reviews.bitcoinabc.org/D12004