Tests for diff notes (without failures )

What does this MR do?

Adds specs for diff notes.

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

We need to ensure that this doesn't break master again.

Why was this MR needed?

What are the relevant issue numbers?

Closes #20957 (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 style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together

mentioned in merge request !5681 (merged)

Added 1447 commits:

• 4e978ec1...2c1062f8 - 1446 commits from branch master
• d5dc0264 - Replaced all first with match: equivalents

Added 231 commits:

• d5dc0264...12fe6a6f - 230 commits from branch master
• 7b4110a4 - Replaced all first with match: equivalents

Milestone changed to %8.11

Added 200 commits:

• 7b4110a4...fb84439a - 198 commits from branch master
• 884baf26 - Replaced all first with match: equivalents
• 5906cca0 - Fixed timing issue with selecting parallel or inline view types

Reassigned to @stanhu

Milestone changed to %8.12

mentioned in commit 110d5348

mentioned in merge request !5823 (closed)

Status changed to merged

mentioned in commit 86d3aa5b

mentioned in commit ed94b9b4

mentioned in commit 02591b04

mentioned in commit 616af037

mentioned in commit 4a83cecd

Mentioned in commit 4a83cecd

Mentioned in commit ed94b9b4

Mentioned in commit 02591b04

Mentioned in commit 616af037