Fix markdown_spec to not use before(:all) in order to properly cleanup database after testing

CHANGELOG

@@ -37,6 +37,7 @@ v 8.9.0 (unreleased)
   - Add Application Setting to configure Container Registry token expire delay (default 5min)
   - Cache assigned issue and merge request counts in sidebar nav
   - Cache project build count in sidebar nav
+  - Fix markdown_spec to use before instead of before(:all) to properly cleanup database after testing
   - Reduce number of queries needed to render issue labels in the sidebar
   - Improve error handling importing projects
   - Remove duplicated notification settings

spec/features/markdown_spec.rb

@@ -180,7 +180,7 @@ describe 'GitLab Markdown', feature: true do
     end
   end
 
-  before(:all) do
+  before do
     @feat = MarkdownFeature.new
 
     # `markdown` helper expects a `@project` variable
@@ -188,7 +188,7 @@ describe 'GitLab Markdown', feature: true do
   end
 
   context 'default pipeline' do
-    before(:all) do
+    before do
       @html = markdown(@feat.raw_markdown)
     end