Add Business Rule: Auto-Escalate Incident Priority for VIP Callers

[Ayushmann13479]

PR Description:

Adds a Before Business Rule on the incident table that automatically
escalates priority, urgency, and impact to 1 - Critical when the
caller is flagged as a VIP user in sys_user. Includes README with
configuration steps and example output.

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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