User Research Material: Interview Questions

This sub-issue addresses the creation of interview questions for the Onboarding Experience Study for Knative Eventing (#130). The interviews aim to gather qualitative data to gain deeper insights into user experiences and challenges.

**Tasks**:
1. Develop a comprehensive set of interview questions targeting new, current, and past users.
2. Ensure the questions cover key areas such as initial setup, documentation clarity, specific challenges, and suggestions for improvement.
3. Review and refine the questions to ensure they elicit detailed and useful responses.

**Link to Main Issue**: [Onboarding Experience Study for Knative Eventing #130](https://github.com/knative/eventing-onboarding-research/issues/130)