Fix trends returning less results per page when filtered in REST API (#17996)

- Change filtering and pagination to occur in SQL instead of Redis
- Change rank/score displayed on trends in admin UI to be locale-specific

app/models/trends/base.rb

@@ -37,12 +37,12 @@ class Trends::Base
     Trends::Query.new(key_prefix, klass)
   end
 
-  def score(id)
-    redis.zscore("#{key_prefix}:all", id) || 0
+  def score(id, locale: nil)
+    redis.zscore([key_prefix, 'all', locale].compact.join(':'), id) || 0
   end
 
-  def rank(id)
-    redis.zrevrank("#{key_prefix}:allowed", id)
+  def rank(id, locale: nil)
+    redis.zrevrank([key_prefix, 'allowed', locale].compact.join(':'), id)
   end
 
   def currently_trending_ids(allowed, limit)