Add reset button for language filter

What does this MR do and why?

Add "Reset filters" button for the language filter.

This MR is a follow-up stemming from this comment: !107973 (comment 1264001729)

Screenshots or screen recordings

before	after

How to set up and validate locally

1. Checkout this branch
2. Enable the language aggregation

   echo 'Feature.enable(:search_blobs_language_aggregation)' | rails c

3. Setup the Advanced Search https://gitlab.com/gitlab-org/gitlab-development-kit/blob/main/doc/howto/elasticsearch.md
4. Enable the Advanced Search http://gdk:3000/admin/application_settings/advanced_search
5. Visit the search page http://gdk:3000/search
6. Scope blobs (code item in the sidebar menu) are now only visible when a group or project is selected.
7. Scope 'blobs' contains language filter

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #342651 (closed)