chore(hits): update banner link type

[taylorcjohnson]

Summary

This minor PR updates makes the url property of the new banner type (part of SearchResults.renderingContent.widgets.banners) required. link is still optional, but if link is present then we want to ensure that the url is also present.

Part of EMERCH-1370

Result

Green CI (all tests still pass)

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Sandbox	Source
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example-react-instantsearch-getting-started	Configuration
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example-react-instantsearch-next-routing-example	Configuration
example-vue-instantsearch-getting-started	Configuration

[Haroenv]

looks good, no change in the code?

[taylorcjohnson]

looks good, no change in the code?

Thanks for taking a look @Haroenv - that prompted me to double check and I did find one other change.

Should the Banner type be added to the SearchResults namespace within algoliasearchHelper (like Facet) and then used in SearchResults class definition or is that excessive? I assume it could be use in instantsearch-ui-components/src/components/Hits.tsx instead of manually creating a banner type there.

[Haroenv]

if I remember it correctly ui-components has no dependency on the helper, so that would maybe complicate things. I think it's good as-is