I would like to run some security/sanitation checks before every pipeline that gets run.  It would do things like:

• Check for certain files existing in the repository.
• Check the contents of some files to validate certain conditions are met with those contents.

The above could be accomplished (as well as arbitrarily many other things) if a library is able to define a default step to run from the global pipeline library before every pipeline run for all projects and branches.

This is different than JENKINS-45415 because it could show up in user pipeline visualizations as an actual pipeline stage.