Fix `kedro run` on demo-project

[rashidakanchwala]

Description

The Kedro CLI has undergone some modifications, leading to inconsistencies with our demo-project's cli.py file. Upon investigation, @ankatiyar discovered that this issue was because of outdated code within cli.py i.e.package_name argument for KedroSession.create().

@ankatiyar recommended removing cli.py file and it made sense because I am not sure why we had the file in the first place and removing it does not break anything.

Development notes

QA notes

Checklist

• [ ] 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
• [ ] Added new entries to the RELEASE.md file
• [ ] Added tests to cover my changes

[ravi-kumar-pilla]

Awesome !! Thanks @ankatiyar and @rashidakanchwala