Also removes dropdown HTML where is not needed.

This is for when user has not logged in

Also customizes the message for the “Comment” option to match the current noteable

Removes the duplicated search icon in emoji menu

Closes #30416 and #30016

See merge request !10472

Render PDFs in GitLab

See merge request !10419

Document how ETag caching middleware handles query parameters

See merge request !10482

Use NamespaceValidator::WILDCARD_ROUTES in ETag caching middleware

See merge request !10478