Azure DevOps plugin support

[ewega]

Summary

Add Azure DevOps as a supported DevOps tool in the CLI.

Changes

• Add new ConnectionDef for Azure DevOps in connectionRegistry
• Azure DevOps-specific fields: organization URL, PAT
• Azure DevOps scope handling: org/project/repo hierarchy
• Token resolution from AZURE_DEVOPS_PAT env var
• Set Available: true on the Azure DevOps entry

Acceptance Criteria

• gh devlake configure connection --plugin azure-devops creates an Azure DevOps connection
• Azure DevOps appears in interactive plugin picker
• Azure DevOps scopes work with org/project/repo hierarchy