Rename use_replica to use_replica_if_possible

Issue https://gitlab.com/gitlab-org/gitlab/-/issues/322133

app/models/application_record.rb

@@ -53,7 +53,7 @@ class ApplicationRecord < ActiveRecord::Base
   # Start a new transaction with a shorter-than-usual statement timeout. This is
   # currently one third of the default 15-second timeout
   def self.with_fast_read_statement_timeout
-    ::Gitlab::Database::LoadBalancing::Session.current.use_replica do
+    ::Gitlab::Database::LoadBalancing::Session.current.use_replica_if_possible do
       transaction(requires_new: true) do
         connection.exec_query("SET LOCAL statement_timeout = 5000")
 

ee/lib/gitlab/database/load_balancing/connection_proxy.rb

@@ -18,7 +18,6 @@ module Gitlab
           delete
           delete_all
           insert
-          transaction
           update
           update_all
         ).freeze

ee/lib/gitlab/database/load_balancing/session.rb

@@ -61,7 +61,7 @@ module Gitlab
         # - If the queries are about to write
         # - The current session already performed writes
         # - It prefers to use primary, aka, use_primary or use_primary! were called
-        def use_replica(&blk)
+        def use_replica_if_possible(&blk)
           return yield if use_primary? || performed_write?
 
           begin
@@ -74,7 +74,7 @@ module Gitlab
         end
 
         def use_replica?
-          @use_replica && !use_primary? && !performed_write?
+          @use_replica == true && !use_primary? && !performed_write?
         end
 
         def write!