Fix Kedro-Viz waiting for valid Kedro Project

[ravi-kumar-pilla]

Description

Resolves #1761

Development notes

• Users should be able to run kedro viz run from child dir of a kedro project.
• Implement util functions _is_project and _find_kedro_project to tackle kedro project not found issue.
• Update pytests

NOTE: We can implement execution of kedro viz build and kedro viz deploy from child dir in a separate PR as there needs to be a discussion around where to save the local build folder when the user runs from child dir.

QA notes

• All tests should pass

Checklist

• [x] Read the contributing guidelines
• [ ] Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• [ ] Updated the documentation to reflect the code changes
• [x] Added new entries to the RELEASE.md file
• [x] Added tests to cover my changes