feat: Add redis streams length e2e test images (#4277)

[jkbmdk]

Images added for testing issue kedacore/keda#4277

Checklist

• Commits are signed with Developer Certificate of Origin (DCO)
• A PR is opened to update the documentation on our docs repo

Fixes #

[JorTurFer]

Hi,
What has changed from already existing images? The only change I can see is that these images don't consume the messages (or at least, I can't see how)

[jkbmdk]

Hey, current images (for cluster and sentinel) reads messages and acks on them, but do not removes messages from the stream, it works as an append only stream. Provided images pops out readen messages, so the stream length decreases

[zroubalik]

Thanks!
I am curious wouldn't it make a sense to modify existing images and sources? ie. add some parameter to enable/disable this feature?
This might be easier to maintain for us.

[jkbmdk]

I think it's possible to extend redis cluster and sentinel images, but standalone is outside of the repository. It might be easier to rewrite standalone image/test, shall I do this?

[JorTurFer]

I think that if this is something we can parametrize, we could parametrize it and also adding the code for standalone redis. I mean, you have already added the code with the new feature, you could just replace the already existing external image using your code with the flag

[jkbmdk]

I've made one image handling all redis-streams test cases, "one to rule them all"

[JorTurFer]

LGTM!
Thanks for the improvement