Labeled Training Data Support

[Copilot]

Description

Adds support for creating custom analyzers with labeled training data from Azure Blob Storage. Introduces a new sample, exposes a simplified constructor for LabeledDataKnowledgeSource, and improves operation ID parsing robustness.

Sample and Documentation

• Added Sample16_CreateAnalyzerWithLabels.md demonstrating labeled training data workflow with Azure Blob Storage setup, code snippets, and helper methods for data upload and access
• Updated README to document labeled training data capability and reference new sample

API Enhancement

• Added LabeledDataKnowledgeSource constructor accepting only container URL (file list path optional) across all target frameworks via new partial class

Other Changes

• Improved operation ID extraction from Operation-Location header in OperationWithId.cs
• Updated assets.json build tag

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