chore: Improve email parsing using email trimmer gem (#3611)

Email parsing using email_trimmer gem

Fixes: #3539 , #2954, #3572

app/presenters/html_parser.rb

@@ -0,0 +1,31 @@
+class HtmlParser
+  def self.parse_reply(raw_body)
+    new(raw_body).filtered_text
+  end
+
+  attr_reader :raw_body
+
+  def initialize(raw_body)
+    @raw_body = raw_body
+  end
+
+  def document
+    @document ||= Nokogiri::HTML(raw_body)
+  end
+
+  def filter_replies!
+    document.xpath('//blockquote').each { |n| n.replace('> ') }
+    document.xpath('//table').each(&:remove)
+  end
+
+  def filtered_html
+    @filtered_html ||= begin
+      filter_replies!
+      document.inner_html
+    end
+  end
+
+  def filtered_text
+    @filtered_text ||= Html2Text.convert(filtered_html)
+  end
+end