[Webcomponents] : Full text search

[cmoinier]

Description

This PR makes numerous fixes on the gn-search-input webcomponent.

• Placeholder is now an Input to avoid having an empty value
• White background for dropdown
• Fixed space between input and dropdown
• Fixed results-list implementation in gn-search-input-and-results
• Ported various fixes from geocat
• Added cache cleaning in build script because changes are not always taken into account
• Added e2e component testing

Architectural changes

none

Quality Assurance Checklist

• Commit history is devoid of any merge commits and readable to facilitate reviews
• If new logic ⚙️ is introduced: unit tests were added
• If new user stories 🤏 are introduced: E2E tests were added
• If new UI components 🕹️ are introduced: corresponding stories in Storybook were created
• If breaking changes 🪚 are introduced: add the breaking change label
• If bugs 🐞 are fixed: add the backport <release branch> label
• The documentation website 📚 has received the love it deserves

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[github-actions]

Affected libs: api-repository,
Affected apps: webcomponents,

• 🚀 Build and deploy storybook and demo on GitHub Pages
• 📦 Build and push affected docker images

[github-actions]

📷 Screenshots are here!