Drop old int4 PK column for push_event_payloads

- Drop column `event_id_convert_to_bigint`

Column wasignored in 14.3 with
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/69339.

https://gitlab.com/gitlab-org/gitlab/-/issues/338071.

Changelog: other

db/post_migrate/20210922091402_drop_int4_column_for_push_event_payloads.rb

+# frozen_string_literal: true
+
+class DropInt4ColumnForPushEventPayloads < Gitlab::Database::Migration[1.0]
+  enable_lock_retries!
+
+  def change
+    remove_column :push_event_payloads, :event_id_convert_to_bigint, :integer, null: false, default: 0
+  end
+end

db/schema_migrations/20210922091402

+4f3a1dbf39f1955122f94616952bfe04836c43e97268035b2daec3bc16e55e66
\ No newline at end of file

db/structure.sql

@@ -18479,7 +18479,6 @@ ALTER SEQUENCE protected_tags_id_seq OWNED BY protected_tags.id;
 
 CREATE TABLE push_event_payloads (
     commit_count bigint NOT NULL,
-    event_id_convert_to_bigint integer DEFAULT 0 NOT NULL,
     action smallint NOT NULL,
     ref_type smallint NOT NULL,
     commit_from bytea,

spec/migrations/20210922091402_drop_int4_column_for_push_event_payloads_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+require_migration!('drop_int4_column_for_push_event_payloads')
+
+RSpec.describe DropInt4ColumnForPushEventPayloads do
+  let(:push_event_payloads) { table(:push_event_payloads) }
+
+  it 'correctly migrates up and down' do
+    reversible_migration do |migration|
+      migration.before -> {
+        expect(push_event_payloads.column_names).to include('event_id_convert_to_bigint')
+      }
+
+      migration.after -> {
+        push_event_payloads.reset_column_information
+        expect(push_event_payloads.column_names).not_to include('event_id_convert_to_bigint')
+      }
+    end
+  end
+end