Remove temp index on job artifacts

We needed this index to run migration
20200809221641_migrate_license_management_artifacts_to_license_scanning
Since this migration is rolled up, we can remove the index

changelogs/unreleased/233387-remove-lc-temp-index.yml

+---
+title: Remove temp index on job artifacts
+merge_request: 45565
+author:
+type: changed

db/migrate/20201019130244_remove_license_compliance_temp_index.rb

+# frozen_string_literal: true
+
+class RemoveLicenseComplianceTempIndex < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'index_ci_job_artifacts_on_license_compliance_file_types'
+
+  disable_ddl_transaction!
+
+  def up
+    remove_concurrent_index_by_name :ci_job_artifacts, name: INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index :ci_job_artifacts, [:job_id, :file_type], where: 'file_type = 10 OR file_type = 101', name: INDEX_NAME
+  end
+end

db/schema_migrations/20201019130244

+fcd2cc46dae4f4da96ac5a2100a9de9bd360defee82a9c9d6cfbda0e1507ee66
\ No newline at end of file

db/structure.sql

@@ -20030,8 +20030,6 @@ CREATE INDEX index_ci_job_artifacts_on_file_store ON ci_job_artifacts USING btre
 
 CREATE UNIQUE INDEX index_ci_job_artifacts_on_job_id_and_file_type ON ci_job_artifacts USING btree (job_id, file_type);
 
-CREATE INDEX index_ci_job_artifacts_on_license_compliance_file_types ON ci_job_artifacts USING btree (job_id, file_type) WHERE ((file_type = 10) OR (file_type = 101));
-
 CREATE INDEX index_ci_job_artifacts_on_project_id ON ci_job_artifacts USING btree (project_id);
 
 CREATE INDEX index_ci_job_artifacts_on_project_id_for_security_reports ON ci_job_artifacts USING btree (project_id) WHERE (file_type = ANY (ARRAY[5, 6, 7, 8]));