[Epic][TypeSpec Authoring][Telemetry] Collect user feedback from early adopters and telemetry analysis

## Overview

Collect user feedback for the **azure-typespec-author** Copilot skill to measure adoption, effectiveness, and identify areas for improvement.

## Feedback Channels

### 1. Skill Invocation Telemetry
- Number of skill invocations (total and per-user)
- Task completion and failure rates
- Task type breakdown (API Versioning, Resource Definitions, Resource Operations, Models & Types)
- Pending on dashboard

### 2. Sanitized User Prompts Telemetry
- Collect sanitized/anonymized user prompts to understand common usage patterns
- Identify most/least used prompt categories
- Detect unclear or failing prompt patterns

### 3. User Conversations
- Conduct feedback sessions with early adopter teams
- Gather qualitative insights on authoring experience, output quality, and pain points

### 4. User Quick Feedback
- Collect in-session thumbs up/down or rating feedback after task completion
- Track user satisfaction trends over time