Enhance Filters on Search Landing Page: Split `News` into `Blog` and `Event`

[zelinh]

We need to improve the current filters on the search landing page by splitting the News filter into two separate filters: Blog and Event. This will allow users to have more granular control over their search and improve the overall experience.

• [x] Modify Label Generation: Replace the News label generated when building the website with Blog and keep the current Event label. https://github.com/opensearch-project/project-website/blob/main/_plugins/search-indexer.rb Ensure that the filtering logic is updated to reflect this change.

• [x] Update UI: Adjust the frontend to display Blog and Event as separate options in the filter menu. Ensure the design and layout remain consistent with the current interface.

• [x] Backend Support: Update the API and query support in the backend to accommodate the split. Test the updated filter logic to ensure correct behavior for both Blog and Event filters.

[zelinh]

Infra backend is added to support more parameter during search.

[zelinh]

Close this issue as it's completed.