#26790 whitelist style attribute in event_note

What does this MR do?

Whitelist style attribute when sanitizing todo body.

Are there points in the code the reviewer needs to double check?

Tests: if they are in the appropriate file, and if they cover the proposed fix.

Why was this MR needed?

Fix #26790 (closed)

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #26790 (closed)

Rails::Html::WhiteListSanitizer.allowed_attributes have default value the set. href src width height alt cite datetime title class name xml:lang abbr[1]. So the call sanitize(text, tags: %w(a img b pre code p span)) was removing the style attribute from the label span. I've added style attribute to the default set.

[1] https://github.com/rails/rails-html-sanitizer/blob/663bf35d17cf35d0385861902362333a789cc642/lib/rails/html/sanitizer.rb#L110