Explicitly remove relative_url.rb file

Since version 9.3.0, we are not using relative_url.rb file for
configuring relative URLs, but an env variable. However, this caused the
issue of stale relative_url.rb files in a specific scenario. When
someone used relative URLs before version 9.3.0, upgraded to 9.3.0 and
then removed the usage of relative url. In that case, the
relative_url.rb will present, causing this issue. This commit explicitly
removes those remnants from previous versions.

files/gitlab-cookbooks/gitlab/recipes/gitlab-rails.rb

@@ -315,6 +315,16 @@ rails_env = {
   'RAILS_ENV' => node['gitlab']['gitlab-rails']['environment'],
 }
 
+# Explicitly deleting relative_urls.rb file and link that was used prior to
+# version 9.3.0
+link File.join(gitlab_rails_source_dir, "config/initializers/relative_url.rb") do
+  action :delete
+end
+
+file File.join(gitlab_rails_etc_dir, "relative_url.rb") do
+  action :delete
+end
+
 gitlab_relative_url = node['gitlab']['gitlab-rails']['gitlab_relative_url']
 rails_env['RAILS_RELATIVE_URL_ROOT'] = gitlab_relative_url if gitlab_relative_url