Remove cortexOrgID from Prometheus scaler

[MeenuyD]

In line with the deprecation of cortexOrgID in v2.10 and its scheduled removal in v2.12, this commit removes all references to cortexOrgID within the Prometheus scaler codebase and documentation.
Fixes #5538

[tomkerkhove]

Mind updating the docs as well please?

[MeenuyD]

Done

[SpiritZhou]

Could you help to update the CHANGELOG?

[MeenuyD]

Can you please tell me where should i update i am new in this

[SpiritZhou]

You can update it in https://github.com/kedacore/keda/blob/main/CHANGELOG.md

There is a checklist in default description when you create a PR. You can follow it in the next time.

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)

[JorTurFer]

Can you please tell me where should i update i am new in this

this is the file https://github.com/kedacore/keda/blob/main/CHANGELOG.md 😄

[tomkerkhove]

@MeenuyD Any update on this PR?