fix: add required attributes to function and workflow definition inputs

[zimeg]

Type of change

• [ ] New sample
• [ ] New feature
• [x] Bug fix
• [ ] Documentation

Summary

This PR adds required attributes to the definitions of the included workflows and functions so that everything completes as expected every time.

Fixes a possible problem of a trigger being created without channel for the sample_workflow and undefined inputs if the sample_function is distributed.

Requirements

• [x] I’ve checked my submission against the Samples Checklist to ensure it complies with all standards
• [x] I have ensured the changes I am contributing align with existing patterns and have tested and linted my code
• [x] I've read and agree to the Code of Conduct

[zimeg]

@hello-ashleyintech and thank you kindly for the review 👏 👏