Revert backfill on ci_build_trace_sections

This disables and removes the backfill for the int8 migration on
ci_build_trace_sections.

Changelog: other

db/post_migrate/20210430121542_backfill_ci_build_trace_sections_for_bigint_conversion.rb

@@ -7,7 +7,8 @@ class BackfillCiBuildTraceSectionsForBigintConversion < ActiveRecord::Migration[
   COLUMN = :build_id
 
   def up
-    backfill_conversion_of_integer_to_bigint TABLE, COLUMN, batch_size: 15000, sub_batch_size: 100, primary_key: COLUMN
+    # No-op to disable the migration:
+    # backfill_conversion_of_integer_to_bigint TABLE, COLUMN, batch_size: 15000, sub_batch_size: 100, primary_key: COLUMN
   end
 
   def down

db/post_migrate/20210722110515_revert_backfill_ci_build_trace_sections_for_bigint_conversion.rb

+# frozen_string_literal: true
+
+class RevertBackfillCiBuildTraceSectionsForBigintConversion < ActiveRecord::Migration[6.1]
+  include Gitlab::Database::MigrationHelpers
+
+  TABLE = :ci_build_trace_sections
+  COLUMN = :build_id
+
+  def up
+    revert_backfill_conversion_of_integer_to_bigint TABLE, COLUMN, primary_key: COLUMN
+  end
+
+  def down
+    backfill_conversion_of_integer_to_bigint TABLE, COLUMN, batch_size: 15000, sub_batch_size: 100, primary_key: COLUMN
+  end
+end

db/schema_migrations/20210722110515

+c9057cb28d2576551eafe78998023742018fa8351f2e550b7e35832a5509d21c
\ No newline at end of file