Enhance Theme Search Functionality

Trac ticket: https://core.trac.wordpress.org/ticket/58307

Current behavior

• In the current version, we can only search themes using either the browse tab or search term, but we can't use both together.

Enhancement

• This PR enhances the theme functionality by supporting the combined query.
• User can search the theme using a browse and a search term.
• We can also apply filters on search from the filter tab.
• Add a remove filter button after the edit button to remove all filters without opening the filter panel.