Ignore routes matching legacy_*_redirect in route specs

Routes with the name `legacy_*_redirect` may have wildcards deliberately, in
order to support routing old paths to new paths. As long as these routes are
tested independently, they do not need to fail the path regex spec.

spec/lib/gitlab/path_regex_spec.rb

@@ -68,14 +68,27 @@ describe Gitlab::PathRegex do
     message
   end
 
-  let(:all_routes) do
+  let(:all_non_legacy_routes) do
     route_set = Rails.application.routes
     routes_collection = route_set.routes
     routes_array = routes_collection.routes
-    routes_array.map { |route| route.path.spec.to_s }
+
+    non_legacy_routes = routes_array.reject do |route|
+      route.name.to_s =~ /legacy_(\w*)_redirect/
+    end
+
+    non_deprecated_redirect_routes = non_legacy_routes.reject do |route|
+      app = route.app
+      # `app.app` is either another app, or `self`. We want to find the final app.
+      app = app.app while app.try(:app) && app.app != app
+
+      app.is_a?(ActionDispatch::Routing::PathRedirect) && app.block.include?('/-/')
+    end
+
+    non_deprecated_redirect_routes.map { |route| route.path.spec.to_s }
   end
 
-  let(:routes_without_format) { all_routes.map { |path| without_format(path) } }
+  let(:routes_without_format) { all_non_legacy_routes.map { |path| without_format(path) } }
 
   # Routes not starting with `/:` or `/*`
   # all routes not starting with a param