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]

#14135 Bundle Size — 62.52MiB (-0.03%).

95ec08f(current) vs 916e8b9 master#14124(baseline)

Warning

Bundle contains 70 duplicate packages – View duplicate packages

Bundle metrics   2 changes 1 improvement

	Current #14135	Baseline #14124
Initial JS	45.65MiB(-0.04%)	45.67MiB
Initial CSS	0B	0B
Cache Invalidation	100%	21.56%
Chunks	30	30
Assets	33	33
Modules	4381	4381
Duplicate Modules	520	520
Duplicate Code	31.61%	31.61%
Packages	472	472
Duplicate Packages	70	70

Bundle size by type   2 changes 2 improvements

	Current #14135	Baseline #14124
JS	62.51MiB (-0.03%)	62.53MiB
HTML	11.12KiB (-0.32%)	11.16KiB

Bundle analysis report Branch chore/clear-warns Project dashboard

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