fix(ui5-search-field): add scope-value property

[MapTo0]

We received stakeholder feedback that selecting search scopes wasn’t very app-friendly. To address this, we updated the interaction model by adding a value property to the search-scope component and a scope-value property to the Search component. These now define the currently selected search scope.

<ui5-search-field scope-value="apps">
	<ui5-search-scope text="All" value="all" slot="scopes"></ui5-search-scope>
	<ui5-search-scope text="Apps" value="apps" slot="scopes"></ui5-search-scope>
	<ui5-search-scope text="Products" value="products" slot="scopes"></ui5-search-scope>
</ui5-search-field>

[ui5-webcomponents-bot]

🧹 Preview deployment cleaned up: https://pr-12795--ui5-webcomponents.netlify.app

[pskelin]

looks good

[ui5-webcomponents-bot]

🎉 This PR is included in version v2.18.0-rc.1 🎉

The release is available on v2.18.0-rc.1

Your semantic-release bot 📦🚀

[ui5-webcomponents-bot]

🎉 This PR is included in version v2.18.0 🎉

The release is available on v2.18.0

Your semantic-release bot 📦🚀