Fix performance bottleneck when rendering large wiki pages

`Nokogiri::XML::Node#ancestors` appears to be much slower than
`HTML::Pipeline::Filter#has_ancestor?` for these purposes. We already use
`#has_ancestor?` elsewhere, so this change also makes this filter more
consistent with other banzai filters.

changelogs/unreleased/48269-wiki-page-returns-error-code-502.yml

+---
+title: Remove performance bottleneck preventing large wiki pages from displaying
+merge_request: 20174
+author:
+type: performance

lib/banzai/filter/gollum_tags_filter.rb

@@ -56,10 +56,12 @@ module Banzai
       # Pattern to match allowed image extensions
       ALLOWED_IMAGE_EXTENSIONS = /.+(jpg|png|gif|svg|bmp)\z/i.freeze
 
+      # Do not perform linking inside these tags.
+      IGNORED_ANCESTOR_TAGS = %w(pre code tt).to_set
+
       def call
         doc.search(".//text()").each do |node|
-          # Do not perform linking inside <code> blocks
-          next unless node.ancestors('code').empty?
+          next if has_ancestor?(node, IGNORED_ANCESTOR_TAGS)
 
           # A Gollum ToC tag is `[[_TOC_]]`, but due to MarkdownFilter running
           # before this one, it will be converted into `[[<em>TOC</em>]]`, so it