StarCoder SFT test + bump PyT NGC image to 23.09

[janekl]

What does this PR do ?

Add SFT test for StarCoder MCore checkpoint.

Collection: NLP

Changelog

• Editing Jenkinsfile

Usage

• To be used in CI

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• Make sure you read and followed Contributor guidelines
• Did you write any new necessary tests?
• Did you add or update any necessary documentation?
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PR Type:

• New Feature
• Bugfix
• Documentation

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Additional Information

• Related to HF StarCoder to NeMo conversion script #7421