feat(atomic): add alt text field on atomic-result-image

[fpbrault]

This PR adds a field on atomic-result-image that will be used as the value of the alt text, similar to atomic-product-image.

https://coveord.atlassian.net/browse/KIT-3243

[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

Changes were made