Merge branch '19092-fix-event-for-legacydiffnote-not-considered-note' into 'master'

Fix diff comments not showing up in activity feed

## What does this MR do?

It fixes the detection of note events to check for `Note` and `LegacyDiffNote`.

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

No? /cc @DouweM (since I believe you introduced `LegacyDiffNote`

## Why was this MR needed?

To fix #19092.

## What are the relevant issue numbers?

Fixes #19092.

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] Added for this feature/bug
  - [ ] 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 !5069
(cherry picked from commit b5b17d00eddef8011e3a71d5f4ad46c6d40cbf8a)

1 files changed, 1 insertions, 0 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 2056b5e7b36..545a9f66b98 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,7 @@
 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.9.5
+  - Fix diff comments not showing up in activity feed. !5069
   - Add index on both Award Emoji user and name. !5061
   - Downgrade to Redis 3.2.2 due to massive memory leak with Sidekiq. !5056
   - Re-enable import button when import process fails due to namespace already being taken. !5053