Clean rspc tests related to the new blob multi-results search pate

Background

Based on the reviewer comment: !160955 (comment 2024323352)

Based on the reviewer comment: !160956 (comment 2025610360)

Proposal

I need to clean up some temporary workarounds in the rspec:

ee/spec/requests/custom_roles/read_code/request_spec.rb ee/spec/features/search/zoekt/search_spec.rb

Simplify mock data for graphQL

spec/frontend/search/mock_data.js