Replace unique keyframes mixin with specific keyframe animation names

What does this MR do?

Replaces unique-keyframes mixin with include-keyframes mixin

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

Shouldn't be 👍🏻

Why was this MR needed?

Some users had GitLab hosted in a distributed environment that makes unique-keyframes a non-viable implementation. The randomized animation names from unique-keyframes was not being picked up by the different servers which resulted in 404 errors.

Screenshots (if relevant)

None

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #22629 (closed)