Investigate and document the approach for managing previous release pipelines and creating new release pipelines for OSC 1.12 in Konflux.

Details:

After the 1.10 release, we have used the pipeline template mechanism documented in the Konflux documentation
We have created template files and documented the process to use them , and we successfully created 1.10 pipelines, making it possible to release 1.10.1 -> 1.10.3 from a dedicated branch (named `osc-release-v1.10`) while development for 1.11 continued on the default branches of our repositories.

We wanted to do the same for 1.11 after its release, to allow parallel development of 1.12, while keeping the ability to make 1.11.x releases if need be. But discussing with the Konflux support, we were told that the template mechanism we used was deprecated, and that something new would be implemented to support our use case, and release "by the end of the year".

Now that we've made 1.11, we need to verify if the "new thing" is available, and how to use it.
If it's not available yet, we have to find a workaround (maybe use the templates anyway?) to achieve our goal.