Add annotation on hpa to disable ownership validation

[junekhan]

Add annotation validations.keda.sh/shared-ownership on hpa to disable ownership validation

Checklist

• When introducing a new scaler, I agree with the scaling governance policy
• I have verified that my change is according to the deprecations & breaking changes policy
• Tests have been added
• Changelog has been updated and is aligned with our changelog requirements
• A PR is opened to update our Helm chart (repo) (if applicable, ie. when deployment manifests are modified)
• A PR is opened to update the documentation on (repo) (if applicable)
• Commits are signed with Developer Certificate of Origin (DCO - learn more)

Fixes #5516

Relates to #

[zroubalik]

I would probably name this annotation validations.keda.sh/hpa-ownership or something around that, to make it more clear what is it about.

WDYT @kedacore/keda-core-contributors

[tomkerkhove]

Agreed!

[zroubalik]

/run-e2e internal
Update: You can check the progress here

[zroubalik]

@junekhan could you please fix the conflict in the changelog and also document this new annotation? https://keda.sh/docs/2.13/concepts/scaling-deployments/

[junekhan]

@junekhan could you please fix the conflict in the changelog and also document this new annotation? https://keda.sh/docs/2.13/concepts/scaling-deployments/

I've fixed the conflict and updated the document for v2.13.