Zoekt cache should invalidate if multi match chunk size changes

What does this MR do and why?

This MR invalidates the Zoekt cache if the requested chunk count is changed when zoekt multi match is enabled

References

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• Related to #517374 (closed)

MR acceptance checklist

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How to set up and validate locally

1. setup gdk for zoekt

2. enable feature flags

   Feature.enable(:zoekt_cache_search_responses)
   Feature.enable(:zoekt_multimatch_frontend)

3. upload this file to any zoekt indexed project: https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/app/models/search/zoekt.rb

4. search in using graphQL in group licensed_and_indexing_enabled as the search term

5. change the chunkCount and verify that the results returned change the number of chunks returned

{
  blobSearch(search: "licensed_and_indexing_enabled",
    chunkCount: 5, 
    groupId: "gid://gitlab/Group/112") {
    matchCount
    perPage
    fileCount
    searchType
    searchLevel
    files {
      path
      fileUrl
      chunks {
        matchCountInChunk
        lines {
          lineNumber
          text
        }
      }
    }
  }
}