Excludes a few filters that require more work:
* lib/banzai/filter/image_lazy_load_filter_spec.rb
* lib/banzai/filter/syntax_highlight_filter_spec.rb
* lib/banzai/filter/table_of_contents_filter_spec.rb
Part of #47424
Allow rendering of PlantUML diagrams in Markdown documents using fenced blocks:
```plantuml
Bob -> Sara : Hello
Sara -> Bob : Go away
```
Closes: #4048