Native auth: add new SDK error when authentication method is blocked

[nilo-ms]

Proposed changes

Add new SDK error when authentication method is blocked

Type of change

• Feature work
• Bug fix
• Documentation
• Engineering change
• Test
• Logging/Telemetry

Risk

• High – Errors could cause MAJOR regression of many scenarios. (Example: new large features or high level infrastructure changes)
• Medium – Errors could cause regression of 1 or more scenarios. (Example: somewhat complex bug fixes, small new features)
• Small – No issues are expected. (Example: Very small bug fixes, string changes, or configuration settings changes)

[Copilot]

Pull Request Overview

This PR adds new SDK error handling for when authentication methods are blocked (error code 550024), expanding the existing error handling system to provide more specific error types and messages when authentication methods or verification contacts are blocked by the server.

• Added a new error type authMethodBlocked to the MFA request challenge error system
• Added a new error type verificationContactBlocked to the registration strong auth challenge error system
• Updated response validators to recognize error code 550024 and map it to appropriate blocked error types

Reviewed Changes

Copilot reviewed 19 out of 21 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
MFARequestChallengeError.swift	Converted from generic error to specific error class with authMethodBlocked type
RegisterStrongAuthChallengeError.swift	Added verificationContactBlocked error type
MSALNativeAuthErrorMessage.swift	Added error messages for blocked authentication methods
MSALNativeAuthESTSApiErrorCodes.swift	Added error code 550024 for authMethodBlocked
Various validator files	Updated to handle error code 550024 and return appropriate blocked error types
Test files	Added comprehensive test coverage for the new error scenarios

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[mustafamizrak]

Shouldn't be it MSALNativeAuthErrorMessage.authMethodBlocked?

[nilo-ms]

No. The auth method blocked message is for the MFA flow. We differentiate the error messages, because the user should act differently between the two errors.