feat:ure Add Incident Trend Analyzer snippet for weekly 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

• Put an x inside of the square brackets to check each item.
• I have read and understood the CONTRIBUTING.md guidelines
• My pull request has a descriptive title that accurately reflects the changes and the description has been filled in above.
• I've included only files relevant to the changes described in the PR title and description
• 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

• I've placed my code snippet(s) in one of the required top-level categories:
  • Core ServiceNow APIs/
  • Server-Side Components/
  • Client-Side Components/
  • Modern Development/
  • Integration/
  • Specialized Areas/
• I've used appropriate sub-categories within the top-level categories
• Each code snippet has its own folder with a descriptive name

Documentation

• I've included a README.md file for each code snippet
• The README.md includes:
  • Description of the code snippet functionality
  • Usage instructions or examples
  • Any prerequisites or dependencies
  • (Optional) Screenshots or diagrams if helpful

Restrictions

• My PR does not include XML exports of ServiceNow records
• My PR does not contain sensitive information (passwords, API keys, tokens)
• My PR does not include changes that fall outside the described scope

[github-actions]

Thank you for your contribution. However, it doesn't comply with our contributing guidelines.

As a reminder, the general requirements (as outlined in the CONTRIBUTING.md file) are the following: follow the folder+subfolder guidelines and include a README.md file explaining what the code snippet does.

Validation errors:

Folder structure violations found:
 - Move 'Server-Side Components/Trend Analyzer/IncidentTrendAnalyzer.js' under a valid folder hierarchy (Category/Subcategory/Use-Case/your-file). Files directly inside 'Server-Side Components' or its subcategories are not allowed.
 - Move 'Server-Side Components/Trend Analyzer/README.md' under a valid folder hierarchy (Category/Subcategory/Use-Case/your-file). Files directly inside 'Server-Side Components' or its subcategories are not allowed.

Review your contribution against the guidelines and make the necessary adjustments. Closing this for now. Once you make additional changes, feel free to re-open this Pull Request or create a new one.