Added node import to the pipeline template

[ElenaKhaustova]

Description

Fixes #3557

Development notes

Added node import to kedro/kedro/templates/pipeline/{{ cookiecutter.pipeline_name }}/pipeline.py

Tried #3557 (comment) but ended up with just # noqa without adding a dummy pipeline as it breaks kedro run after the user run kedro pipeline create which might be confusing:

ValueError: Invalid Node definition: first argument must be a function, not 'ellipsis'.
Format should be: node(function, inputs, outputs)

If we want to add a dummy pipeline, we can also add a dummy node function, so the above error doesn't appear. However, I'm not sure how useful it is, so I left the template as it is.

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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]

Thanks @ElenaKhaustova!

[DimedS]

Thanks, @ElenaKhaustova !