Disabling zstream testing

Steps to do when a variant or a complete kernel stream drops out of support

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Background

Every once in a while, RHEL streams drop out of support, and CKI needs to be disabled there. This might concern the whole stream, or just a specific variant like rt.

Steps to take

Disable the relevant pipelines in rh_metadata.yaml.

For complete streams, add inactive: true to the relevant branch.

To disable only a specific variant, determine the default pipelines from the project, and add an override on the branch for that variable with the pipeline for the variant removed.
Remove the relevant pipelines from .gitlab-ci.yml in the correct branch in the kernel repository. Keep in mind that this file is also used in other derived variant-specific branches.