Revert "FIX: Always clear caches after committing the current transaction" (#22493)

This reverts commit 8310c7842c.

This was breaking precompilation.

lib/discourse.rb

@@ -773,14 +773,14 @@ module Discourse
   def self.received_postgres_readonly!
     time = Time.zone.now
     redis.set(LAST_POSTGRES_READONLY_KEY, time.to_i.to_s)
-    postgres_last_read_only.clear(after_commit: false)
+    postgres_last_read_only.clear
 
     time
   end
 
   def self.clear_postgres_readonly!
     redis.del(LAST_POSTGRES_READONLY_KEY)
-    postgres_last_read_only.clear(after_commit: false)
+    postgres_last_read_only.clear
   end
 
   def self.received_redis_readonly!

lib/distributed_cache.rb

@@ -19,12 +19,4 @@ class DistributedCache < MessageBus::DistributedCache
     self.defer_set(k, value)
     value
   end
-
-  def clear(after_commit: true)
-    if after_commit
-      DB.after_commit { super() }
-    else
-      super()
-    end
-  end
 end