Reduce job running time

[mihai-sysbio]

With the addition of more tests, the validation time can exceed the maximum allowed by GitHub. The limit is 6h for a job, and currently the pipeline creates a job for each model. This job encompasses multiple releases. In the beginning, all releases were tested, then only the last 10, and now only the last 5. Still, for some models the validation job takes more than the allowed time

Suggestion
Once the test suit becomes more stable, it would be worth switching from testing most recent X releases to testing all newer releases than those that have been tested.