Remove outdated job submission code

[rdondera-microsoft]

Description

Fix issue #35403 by removing the outdated submission code in the vision script example. Job submission code is not needed in this script: the NLP script example does not have any and the ml_samples_misc.py script covers job submission in detail.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

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• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[azure-sdk]

API change check

API changes are not detected in this pull request.