CodeInsights: Fix query count filter checker (support count:all)
Created by: vovakulikov
Closes https://github.com/sourcegraph/sourcegraph/issues/30873
By default, all queries for the just-in-time type of insights have a count:99999
filter. But we also want to allow users to input their count filter. The query with two count values is an invalid query so we should detect appearance users count filters in a query and add or not add a default count:99999
. This PR just simply fixes count appearance checker in a way that the checker supports the count: all
filter.