Implement TenantUtil object with methods to extract tenant and tenantID from identifiers, Fixes AB#3370810

[p3dr0rv]

AB#3370810

Move
getTenantFromIdentifier from WorkPlaceJoinUtil
getTenantIdFromLoginHint from AccountChooser

see https://github.com/AzureAD/microsoft-authentication-library-common-for-android/pull/2761/files

[github-actions]

❌ Work item link check failed. Description does not contain AB#{ID}.

Click here to Learn more.

[Copilot]

Pull Request Overview

This PR introduces a new TenantUtil utility object that provides methods for extracting tenant information from various identifiers. The utility is designed to parse email addresses/UPNs and GUIDs to extract tenant hostnames and tenant IDs.

• Adds regex-based validation for identifiers (email/UPN format or GUID format)
• Implements tenant extraction from identifiers with hostname parsing for UPNs
• Provides tenant ID resolution from login hints using Azure Active Directory configuration

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[github-actions]

✅ Work item link check complete. Description contains link AB#3370810 to an Azure Boards work item.

[Copilot]

Pull Request Overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}