Fix %reload_kedro line magic

[ankatiyar]

NOTE: Kedro datasets are moving from kedro.extras.datasets to a separate kedro-datasets package in
kedro-plugins repository. Any changes to the dataset implementations
should be done by opening a pull request in that repository.

Description

I noticed that %reload_kedro wasn't working on develop because _project_path attribute from KedroContext has been removed/ renamed to project_path.

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Checklist

• Read the contributing guidelines
• Signed off each commit with a Developer Certificate of Origin (DCO)
• Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• Updated the documentation to reflect the code changes
• Added a description of this change in the RELEASE.md file
• Added tests to cover my changes
• Checked if this change will affect Kedro-Viz, and if so, communicated that with the Viz team

[ankatiyar]

Need to fix tests for this, wasn't caught because we use a Mocked Kedro Context in the tests 😅

[noklam]

Is there a way to improve the test?

[ankatiyar]

Is there a way to improve the test?

@noklam
I'll create an issue for it, and try to do it in a separate PR.

[merelcht]

LGTM! 👍