Remove VSCode from jhub_apps default services

[jbouder]

VSCode is now added by default to the new JHub Apps/App Launcher side navigation. This update, in addition to Nebari providing a default list of services for jhub_apps (which includes VSCode), is causing a duplicate entry in the side navigation.

This PR removes VSCode from the default jub_apps configuration as it is not needed anymore and resolves the duplicate entry.

Reference Issues or PRs

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What does this implement/fix?

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

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• Did you add new tests?

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