Track when topics are selected from either the general issues or spec…

[Tinydera]

Track topic selections in Google Analytics

Description

Added Google Analytics event tracking for topic selections in case forms. The changes include:

1. Added dataLayer push tracking in edit-multi-select.js for:
   • Topic selection events (when users select topics)
   • Topic removal events (when users remove topics)
2. Tracking data includes:
   • Event name ('topicSelection' or 'topicRemoval')
   • Topic name (selected/removed topic)
   • Topic category (general_issues or specific_topics)
   • Case ID

Context/Issue Link

This change helps track user interactions with topic selections to understand:

• Which topics are most frequently selected
• Topic selection patterns by country
• User behavior in topic selection/removal

Related to analytics implementation for understanding topic selection patterns

How has this been tested? How can it be tested?

To test:

1. Open a case edit or creation form
2. Select topics from either general issues or specific topics dropdowns
3. Remove some topics
4. Verify in Google Tag Manager preview mode that:
   • 'topicSelection' events fire when topics are selected
   • 'topicRemoval' events fire when topics are removed
   • All event parameters (topicName, topicCategory, caseId) are present

Screenshots (if it's a frontend change)

Not applicable as this is tracking implementation without UI changes