fix(atomic): adjust product-list placeholder

[y-lakhdar]

• Add ItemListGuard to prevent the placeholders to be displayed in case no results is returned on the initial page load
• Added the minimum E2E tests to cover the bug fix

https://coveord.atlassian.net/browse/KIT-3329

[developer-experience-bot]

Pull Request Report

PR Title

✅ Title follows the conventional commit spec.

Live demo links

• Storybook

• Playwright report

Bundle Size

File	Old (kb)	New (kb)	Change (%)
case-assist	204.9	204.9	0
commerce	293.1	293.1	0
search	372.4	372.4	0
insight	352.4	352.4	0
product-listing	267	267	0
product-recommendation	170.8	170.8	0
recommendation	217.8	217.8	0
ssr	365.2	365.2	0

SSR Progress

Use case	SSR (#)	CSR (#)	Progress (%)
search	39	44	89
recommendation	0	4	0
product-recommendation	0	10	0
product-listing	0	13	0
case-assist	0	6	0
insight	0	27	0
commerce	0	15	0

Detailed logs

search : buildInteractiveResult
search : buildInteractiveInstantResult
search : buildInteractiveRecentResult
search : buildInteractiveCitation
search : buildGeneratedAnswer
recommendation : missing SSR support
product-recommendation : missing SSR support
product-listing : missing SSR support
case-assist : missing SSR support
insight : missing SSR support
commerce : missing SSR support

[louis-bompart]

LGTM, but unsure about how you "get" the summary state

[olamothe]

All good, apart from summaryState() not being reactive, as pointed out by Louis