Move logic from views/shared/wikis/404.html.haml to helpers/wiki_helper.rb (wiki_404_messages)

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The following discussion from !179545 (merged) should be addressed:

• @eugielimpin started a discussion:

  suggestion (non-blocking): Ideally we do this in the backend (helper) to make testing easier.

    def wiki_404_messages
      messages = {
        title: s_("Wiki404|This page doesn't exist")
        body: s_('Wiki404|Use the sidebar to find a different page.'),
        button_text: nil,
        button_link: nil
      }
  
      # need to check presence of @error here too?
      if current_user.can?(:create_wiki, @wiki.container)
        messages.merge({
          body: _("Wiki404|Would you like to create it?"),
          button_text: s_('WikiEmpty|Create this page…'),
          button_link: wiki_page_path(@wiki, params[:id], view: 'create')
        })
      end
    end
  
  = render Pajamas::EmptyStateComponent.new(svg_path: 'illustrations/empty-state/empty-wiki-md.svg',
    title: messages[:title],
    primary_button_text: messages[:button_text],
    primary_button_link: messages[:button_link],
    empty_state_options: { data: { testid: 'wiki-404' } }) do |c|
  
    - c.with_description do
      = messages[:body]