Add Token Exchange grant type to agent application template

[ranuka-laksika]

Summary

This PR enhances the agent application template and creation flow with two key
improvements:

Token Exchange Grant Type Support - Agent applications now include the Token Exchange grant type (urn:ietf:params:oauth:grant-type:token-exchange) by default

Changes

Token Exchange Grant Type

Files Modified:

• features/admin.extensions.v1/application-templates/templates/agent-application/agent-application.json
• features/admin.extensions.v1/configs/application.tsx

What Changed:

• Added urn:ietf:params:oauth:grant-type:token-exchange to the default grant types in the agent application template
• Updated the allowed grant types configuration to display Token Exchange as a selectable option in the UI
• Agent applications now support token exchange grant type

Grant Types for Agent Applications:

• Authorization Code
• Refresh Token
• CIBA
• Token Exchange (newly added)

Issue:- wso2/product-is#27653

[coderabbitai]

📝 Walkthrough

Walkthrough

The agent-application template's OAuth2 OIDC configuration is extended to support the token-exchange grant type. Corresponding TypeScript configuration is updated to include the token-exchange grant in the allowed grant types.

Changes

Cohort / File(s)	Summary
Agent Application OAuth2 Configuration features/admin.extensions.v1/application-templates/templates/agent-application/agent-application.json, features/admin.extensions.v1/configs/application.tsx	Added urn:ietf:params:oauth:grant-type:token-exchange (ApplicationManagementConstants.OAUTH2_TOKEN_EXCHANGE) to the agent-application OIDC grantTypes list; existing grants retained.
Changeset .changeset/tender-dolls-hang.md	Added a changeset entry documenting the patch bump and noting token-exchange grant support for the agent application template.

🚥 Pre-merge checks | ✅ 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
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.
Changeset Required	✅ Passed	Pull request includes valid changeset file documenting version updates for packages with clear description of Token Exchange grant type addition.
Description check	✅ Passed	The PR description is well-structured with clear purpose, specific files modified, detailed change explanations, and relevant issue reference, though some checklist items are incomplete.
Title check	✅ Passed	The title clearly and specifically describes the main change: adding Token Exchange grant type support to the agent application template, which aligns with all file modifications in the changeset.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.05%. Comparing base (4e29055) to head (0098b03).
⚠️ Report is 491 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10183   +/-   ##
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  Coverage   56.05%   56.05%           
=======================================
  Files          42       42           
  Lines        1024     1024           
  Branches      254      246    -8     
=======================================
  Hits          574      574           
  Misses        416      416           
  Partials       34       34           

Flag	Coverage Δ
@wso2is/core	56.05% <ø> (ø)

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[pavinduLakshan]

Let's add token exchange grant to mcp client application template too. cc: @ayshsandu