chore(test): remove warnings

[liady]

Problem:
Today we have a lot of warnings in our Karma output which really clutters it

Fix:
This PR tries to address some of them:

1. import the default export of package.json instead of import * from
2. change moduleIds from hashed to deterministic (as Webpack recommends)
3. import { act } from @testing-library/react instead of react-dom/test-utils

Manual Tests:
I hereby swear that:

• I opened a hydrogen project and it loaded
• I could navigate to various routes in Preview mode

[github-actions]

Try me

[relativeci]

#15425 Bundle Size — 58.21MiB (-0.02%).

5696d50(current) vs d1d46c1 master#15423(baseline)

Warning

Bundle contains 70 duplicate packages – View duplicate packages

Bundle metrics   2 changes 1 improvement

	Current #15425	Baseline #15423
Initial JS	41.18MiB(-0.03%)	41.19MiB
Initial CSS	0B	0B
Cache Invalidation	100%	18.14%
Chunks	20	20
Assets	22	22
Modules	4190	4190
Duplicate Modules	213	213
Duplicate Code	27.24%	27.24%
Packages	477	477
Duplicate Packages	70	70

Bundle size by type   2 changes 2 improvements

	Current #15425	Baseline #15423
JS	58.2MiB (-0.02%)	58.21MiB
HTML	9.4KiB (-0.21%)	9.42KiB

Bundle analysis report Branch chore/clear-warns Project dashboard

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[liady]

Temporarily closing as a spike to be picked up later