Enhance ADO token retrieval by adding JWT parsing functionality

[MattB-msft]

This pull request modifies the .github/actions/get-ado-token/action.yml file to enhance token handling and introduce a new function for parsing JWT tokens. The most significant change is the addition of the Parse-JWTtoken function, which decodes and parses the payload of a JWT token for better usability and debugging.

Enhancements to token handling:

• Added the Parse-JWTtoken function to decode and parse JWT token payloads, including converting the payload from Base64 to JSON format and returning it as a PowerShell object. This improves token processing and debugging capabilities.
• Replaced the Get-AzAccessToken command with az account get-access-token for obtaining the access token, aligning with updated Azure CLI practices.

[Copilot]

Pull Request Overview

This PR enhances the ADO token retrieval process by replacing the previous Azure PowerShell command with an updated Azure CLI command and introducing a JWT parsing function.

• Replaces Get‐AzAccessToken with az account get‐access-token to align with current Azure CLI practices.
• Implements a new decodeToken function to decode and parse the JWT token payload.