Why do you need them to be separate Pipelines? Because it is convenient or for other reasons?
Do you want everyone of these jobs in every branch that you create? In Pull Requests? Do you want all of these jobs to automatically trigger on every push the repo?
It's possible to do all of these steps in a single Pipeline but I'm curious why you would want to separate it?
We want to run our integration tests, etc. against our per-branch staging environment and then against prod when we deploy the branch there as well. With a "post-deploy" pipeline file, we can keep that logic nice and clean and easily trigger the appropriate job via the API.
With everything in one file, we would have to add the logic to our Jenkins pipeline to handle when to trigger deployments (which is currently done through a service we built that looks at GitHub commit statuses of a certain prefix/listens to Slack slash commands).
Do you want everyone of these jobs in every branch that you create? In Pull Requests? Do you want all of these jobs to automatically trigger on every push the repo?
It's possible to do all of these steps in a single Pipeline but I'm curious why you would want to separate it?