feature: Added Weekly Incident Trend Analysis snippet - week-over-week incident comparison

[BEASTSHRIRAM]

PR Description:

What’s New

Added a JavaScript snippet IncidentTrendAnalyzer.js that calculates and compares incident counts between the current and previous week using GlideAggregate.

Use Case for servicenow devs

This helps ServiceNow developers or admins:

• Monitor trends in ticket volume.
• Detect spikes or drops automatically.
• Schedule weekly trend analysis via Scheduled Script Execution.

Example Output

• Incident count increased by 12 compared to last week.
• Incident count decreased by 8 compared to last week.
• No change in incident volume week-over-week.

Pull Request Checklist

Overview

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• I have read and understood the CONTRIBUTING.md guidelines
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• I've created a new branch in my forked repository for this contribution

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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  • Core ServiceNow APIs/
  • Server-Side Components/
  • Client-Side Components/
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• I've used appropriate sub-categories within the top-level categories
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Documentation

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  • Description of the code snippet functionality
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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

[BEASTSHRIRAM]

Hey @ravichandra1998g please review this
The Incident Trend Analyzer helps ServiceNow admins automatically compare weekly incident volumes using GlideAggregate.
It highlights spikes or drops in tickets for proactive monitoring and workload balancing.
The key logic is in the comparison line:
var diff = thisWeekCount - lastWeekCount;

[snamjosh]

This looks good to me.
However, note that this is available OOB with platform analytics indicators. You don't have to write a script for this requirement.