Split column and limit into separate migrations

Updated schema

db/migrate/20210512183309_add_body_to_findings_evidences_response.rb

 # frozen_string_literal: true
 
 class AddBodyToFindingsEvidencesResponse < ActiveRecord::Migration[6.0]
-  include Gitlab::Database::MigrationHelpers
-
-  DOWNTIME = false
-
-  disable_ddl_transaction!
-
-  def up
+  # rubocop:disable Migration/AddLimitToTextColumns
+  # limit is added in 20210512183310_add_limit_to_findings_evidences_response_body.rb
+  def change
     add_column :vulnerability_finding_evidence_responses, :body, :text
-
-    add_text_limit :vulnerability_finding_evidence_responses, :body, 2048
-  end
-
-  def down
-    remove_column :vulnerability_finding_evidence_responses, :body
   end
+  # rubocop:enable Migration/AddLimitToTextColumns
 end

db/migrate/20210512183310_add_limit_to_findings_evidences_response_body.rb

+# frozen_string_literal: true
+
+class AddLimitToFindingsEvidencesResponseBody < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_text_limit :vulnerability_finding_evidence_responses, :body, 2048
+  end
+
+  def down
+    remove_text_limit :vulnerability_finding_evidence_responses, :body
+  end
+end

db/schema_migrations/20210512183310

+d1e389755e4f5ed0075b07c5680eee5ae3557550071d14360ad3030e4c2d3ac1
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