breaking: Remove the Management API support

[pmathew92]

Changes

This PR removed all classes related to the UsersAPIClient class as we are dropping the support for management APIs from the SDK

Migration

Consumers should expose dedicated endpoints in their own backend and call the Management API from there using a machine-to-machine token, obtained via the Client Credentials flow. See the
v4 Migration Guide for more details.

Checklist

• I have read the Auth0 general contribution guidelines

• I have read the Auth0 Code of Conduct

• All existing and new tests complete without errors

[Copilot]

Pull request overview

Removes the Auth0.Android SDK’s Management API surface area (notably UsersAPIClient and related exception/callback types) and updates the sample app + v4 migration guide accordingly.

Changes:

• Deleted Management API client types (UsersAPIClient, ManagementException, ManagementCallback) and their tests/utilities.
• Updated the sample “Database Login” screen to remove Management API UI/actions and adjusted requested scopes.
• Documented the breaking change and migration path in V4_MIGRATION_GUIDE.md.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
sample/src/main/res/layout/fragment_database_login.xml	Removes Management API-related UI elements from the sample layout.
sample/src/main/java/com/auth0/sample/DatabaseLoginFragment.kt	Removes Management API sample actions/imports and adjusts login scopes/formatting.
auth0/src/test/java/com/auth0/android/util/MockManagementCallback.java	Removes Management API callback test utility.
auth0/src/test/java/com/auth0/android/util/ManagementCallbackMatcher.java	Removes matcher utility tied to Management API callbacks.
auth0/src/test/java/com/auth0/android/management/UsersAPIClientTest.kt	Removes tests for deleted UsersAPIClient.
auth0/src/test/java/com/auth0/android/management/ManagementExceptionTest.kt	Removes tests for deleted ManagementException.
auth0/src/main/java/com/auth0/android/result/UserProfile.kt	Updates KDoc to remove reference to UsersAPIClient.
auth0/src/main/java/com/auth0/android/management/UsersAPIClient.kt	Deletes UsersAPIClient.
auth0/src/main/java/com/auth0/android/management/ManagementException.kt	Deletes ManagementException.
auth0/src/main/java/com/auth0/android/callback/ManagementCallback.kt	Deletes ManagementCallback.
V4_MIGRATION_GUIDE.md	Adds migration guidance for removal of Management API support.

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[utkrishtsahu]

@pmathew92
In Example.md file (- Management API(#management-api) section should also be removed.
Also things related to Managment API's

[utkrishtsahu]

Also in Agents.md file in Repository structure too we cane remove management/ # Management API client
Although its internal.

[pmathew92]

Also in Agents.md file in Repository structure too we cane remove management/ # Management API client
Although its internal.

Agents.md file will be updated all together once all dev for v4 is done @utkrishtsahu