Don't require database review for migration specs

spec/tooling/danger/project_helper_spec.rb

@@ -93,6 +93,9 @@ RSpec.describe Tooling::Danger::ProjectHelper do
       'ee/spec/foo'     | [:backend]
       'ee/spec/foo/bar' | [:backend]
 
+      'spec/migrations/foo'    | [:database]
+      'ee/spec/migrations/foo' | [:database]
+
       'spec/features/foo'                            | [:test]
       'ee/spec/features/foo'                         | [:test]
       'spec/support/shared_examples/features/foo'    | [:test]

tooling/danger/project_helper.rb

@@ -113,6 +113,7 @@ module Tooling
           generator_templates/usage_metric_definition/metric_definition\.yml)\z}x => [:backend, :product_intelligence],
         %r{\A((ee|jh)/)?app/(?!assets|views)[^/]+} => :backend,
         %r{\A((ee|jh)/)?(bin|config|generator_templates|lib|rubocop)/} => :backend,
+        %r{\A((ee|jh)/)?spec/migrations} => :database,
         %r{\A((ee|jh)/)?spec/} => :backend,
         %r{\A((ee|jh)/)?vendor/} => :backend,
         %r{\A(Gemfile|Gemfile.lock|Rakefile)\z} => :backend,