Update sample yml

[JimSuplizio]

The sample yml file for the scheduled events was old and used the old, and incorrect, way to create the payload file. The change to use cat to create a payload file instead of the environment variable was made last year.

I'm also adding excludes to the ci.yml to exclude to YmlAndConfigFiles directory as well as markdown files in the root. Changes only to the samples and/or markdown files shouldn't cause a built and publish of the event processor.