Add AzureUMIMediator support for UMI auth in AI API endpoint seq template

[chira99]

Description

Adds the update artifact file for the Velocity template ai_api_endpoints_seq_template.xml that generates Synapse endpoint sequences to inject AzureUMIMediator when the endpoint authentication type is umi.

Related Issue

• Support Azure User Managed Identities (UMI) for Azure AI Foundry and Cognitive Services Integration api-manager#5043

What's changed

• Added a conditional block in the endpoint sequence template: when
  endpoint.authenticationType is umi (case-insensitive), the
  org.wso2.carbon.apimgt.gateway.mediators.AzureUMIMediator class mediator is inserted
  into the generated sequence
• The mediator acquires an Azure Workload Identity Bearer token and injects it as the
  Authorization header on every outbound request to the backend

Backward compatibility

The new block is fully conditional — existing apikey, aws, and none authentication
types are unaffected.

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds Azure User Managed Identity (UMI) authentication support to API endpoint templates across two distribution modules. Both ai_api_endpoints_seq_template.xml files now include a new authentication-type branch that instantiates AzureUMIMediator when endpoints specify umi/UMI authentication, with corrected conditional block closure.

Changes

Azure UMI Authentication Support

Layer / File(s)	Summary
UMI authentication mediator in both distribution templates all-in-one-apim/modules/distribution/resources/api_templates/ai_api_endpoints_seq_template.xml, api-control-plane/modules/distribution/resources/api_templates/ai_api_endpoints_seq_template.xml	Both templates now close the prior APIKEY authentication conditional and introduce a new case-insensitive umi authentication-type branch that renders org.wso2.carbon.apimgt.gateway.mediators.AzureUMIMediator.

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding AzureUMIMediator support for UMI authentication in the AI API endpoint sequence template, which aligns directly with the changeset modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description clearly explains the changes: adding AzureUMIMediator support for UMI authentication in the endpoint sequence template with full backward compatibility.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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