Python: Updated documentation for Azure AI

[dmytrostruk]

Motivation and Context

Updated the documentation for Azure AI to differentiate between V1 and V2 samples.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

[Copilot]

Pull Request Overview

This PR updates the documentation to clearly differentiate between Azure AI Agent V1 samples (using azure-ai-agents 1.x package with AzureAIAgentClient) and V2 samples (using azure-ai-projects 2.x package with AzureAIClient).

Key changes:

• Added clarifying text to README files explaining the V1/V2 distinction and cross-referencing between sample folders
• Reorganized the main samples README to separate V1 and V2 examples into distinct sections
• Corrected a file path reference error in the samples README

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
python/samples/getting_started/agents/azure_ai_agent/README.md	Added explanation that this folder contains V1 samples with link to V2 folder
python/samples/getting_started/agents/azure_ai/README.md	Added explanation that this folder contains V2 samples with changelog link and reference to V1 folder
python/samples/getting_started/agents/README.md	Updated table to clarify V1 and V2 distinction for Azure AI folders
python/samples/README.md	Separated Azure AI examples into V1 and V2 sections and fixed incorrect file path