Add Dynamic Catalog Variable Label Update Client Script

[mitalizope]

PR Description:

This catalog client script dynamically updates the label of one catalog variable based on the value of another.
When a user selects a value for the Asset Type variable, the label of the Asset Name variable automatically updates to reflect the selected type.
It is useful for providing contextual labels for dependent fields in Service Catalog items.

Pull Request Checklist

Overview

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• I have read and understood the CONTRIBUTING.md guidelines
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Code Quality

• My code is relevant to ServiceNow developers
• My code snippets expand meaningfully on official ServiceNow documentation (if applicable)
• I've disclosed use of ES2021 features (if applicable)
• I've tested my code snippets in a ServiceNow environment (where possible)

Repository Structure Compliance

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Documentation

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Restrictions

• My PR does not include XML exports of ServiceNow records
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• My PR does not include changes that fall outside the described scope

[ravichandra1998g]

Hello @mitalizope

appreciate the effort you’ve put into this contribution. Thank you for contributing!

For Hacktoberfest, we’re aiming for high-quality contributions providing real-world developer use cases. You can see some of the recently merged PRs to know the kind of code snippets we are aiming for.

Also, Please refer to the contributing guidelines.
Expanded Snippets: Code snippets reused from the ServiceNow Documentation or API References are acceptable only if they are expanded in a meaningful way (e.g., with additional context or variations). Remember: "QUANTITY IS FUN, QUALITY IS KEY."

The setLabelOf method example is already available in the ServiceNow Docs. #2291 is closed for the same reason.
https://www.servicenow.com/docs/bundle/zurich-api-reference/page/app-store/dev_portal/API_reference/GlideForm/concept/c_GlideFormAPI.html

Please reopen/ submit a new one after adding more dynamic context/use cases that are more suitable for the Hactoberfest