Merge branch '355573-make-load-balancing-multiple-databases-work-with-db-specs' into 'master'

Make db:migrate:reset work with GITLAB_USE_MODEL_LOAD_BALANCING=true

See merge request gitlab-org/gitlab!82872

.gitlab/ci/rails.gitlab-ci.yml

@@ -377,8 +377,6 @@ db:migrate:reset decomposed:
     - db:migrate:reset
     - .decomposed-database
     - .rails:rules:decomposed-databases
-  variables:
-    GITLAB_USE_MODEL_LOAD_BALANCING: "false"
 
 db:migrate-from-previous-major-version:
   extends: .db-job-base

db/post_migrate/20211028100843_delete_issue_merge_request_taggings_records.rb

@@ -8,8 +8,12 @@ class DeleteIssueMergeRequestTaggingsRecords < Gitlab::Database::Migration[1.0]
   BATCH_SIZE = 3_000
   TAGGABLE_TYPES = %w(Issue MergeRequest)
 
+  class Tagging < ActiveRecord::Base
+    self.table_name = "taggings"
+  end
+
   def up
-    sleep 2 while ActsAsTaggableOn::Tagging.where(taggable_type: TAGGABLE_TYPES).limit(BATCH_SIZE).delete_all > 0
+    sleep 2 while Tagging.where(taggable_type: TAGGABLE_TYPES).limit(BATCH_SIZE).delete_all > 0
 
     remove_concurrent_index_by_name :taggings, INDEX_NAME
   end