11914 set template default

[jp-tosca]

What this PR does / why we need it:

Which issue(s) this PR closes:

• Closes Add a new API to set a template as default #11914

Special notes for your reviewer:

Suggestions on how to test this:

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

Is there a release notes update needed for this change?:

Additional documentation:

[Copilot]

Pull Request Overview

This PR implements API endpoints to set and remove the default template for a dataverse collection, addressing issue #11914.

Key Changes:

• Added POST /api/dataverses/{id}/templates/default/{templateId} endpoint to set a default template
• Added DELETE /api/dataverses/{id}/templates/default endpoint to remove the default template
• Added test coverage for the set default template endpoint with permission checks

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 9 comments.

File	Description
src/main/java/edu/harvard/iq/dataverse/api/Dataverses.java	Implements two new endpoints for setting and removing default templates
src/test/java/edu/harvard/iq/dataverse/api/UtilIT.java	Adds helper methods setDefaultTemplate() and removeDefaultTemplate() for testing
src/test/java/edu/harvard/iq/dataverse/api/DataversesIT.java	Updates testCreateAndGetTemplates() to test setting default template with authorization checks
doc/release-notes/11914-set-template-default-api.md	Documents the new endpoints and their functionality

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[sekmiller]

Added the doc; turning it back over to you.

[github-actions]

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