MLE-25708 Deprecating support for entity services

[rjrudin]

This is solely the domain of DataHub now and should have been deprecated / removed a long time ago.

[github-actions]

Copyright Validation Results
Total: 7 | Passed: 6 | Failed: 0 | Skipped: 1 | at: 2025-12-03 22:55:47 UTC | commit: ad10e92

⏭️ Skipped (Excluded) Files

• build.gradle

✅ Valid Files

• ml-app-deployer/src/main/java/com/marklogic/appdeployer/command/es/GenerateModelArtifactsCommand.java
• ml-app-deployer/src/test/java/com/marklogic/appdeployer/command/es/GenerateModelArtifactsTest.java
• ml-javaclient-util/src/main/java/com/marklogic/client/ext/es/CodeGenerationRequest.java
• ml-javaclient-util/src/main/java/com/marklogic/client/ext/es/EntityServicesManager.java
• ml-javaclient-util/src/main/java/com/marklogic/client/ext/es/GeneratedCode.java
• ml-javaclient-util/src/test/java/com/marklogic/client/ext/es/EntityServicesTest.java

✅ All files have valid copyright headers!