Merge branch '19388-fix-snippets-notes-not-shown' into 'master'

Fix snippets comments not displayed

## What does this MR do?

Fix an issue where comments body were not displayed for project snippets anymore (see commit for details).

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

No.

## Why was this MR needed?

Because of #19388.

## What are the relevant issue numbers?

Fixes #19388.

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [ ] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5045

app/controllers/projects/snippets_controller.rb

@@ -54,7 +54,7 @@ class Projects::SnippetsController < Projects::ApplicationController
   def show
     @note = @project.notes.new(noteable: @snippet)
-    @notes = @snippet.notes.fresh
+    @notes = Banzai::NoteRenderer.render(@snippet.notes.fresh, @project, current_user)
     @noteable = @snippet
   end