Set/Unset a Template as Default

[ChengShi-1]

What this PR does / why we need it:

Based on PR IQSS/dataverse#11989 , set a template to default and remove a template's default setting

Which issue(s) this PR closes:

• Closes Use Case to set default template #408

Related Dataverse PRs:

• Depends on #11989

Special notes for your reviewer:

Suggestions on how to test this:

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

Additional documentation:

[Copilot]

Pull request overview

Adds client support for setting and unsetting a Dataverse collection’s default dataset template.

Changes:

• Introduces SetTemplateAsDefault / UnsetTemplateAsDefault use cases and exports them via src/templates.
• Adds setTemplateAsDefault / unsetTemplateAsDefault methods to TemplatesRepository and ITemplatesRepository.
• Adds unit, integration, and functional tests plus documentation/changelog updates.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/unit/templates/UnsetTemplateAsDefault.test.ts	Unit coverage for UnsetTemplateAsDefault use case behavior and error propagation.
test/unit/templates/SetTemplateAsDefault.test.ts	Unit coverage for SetTemplateAsDefault use case behavior and error propagation.
test/integration/templates/TemplateRepository.test.ts	Integration coverage for new repository methods against the API.
test/functional/templates/UnsetTemplateAsDefault.test.ts	Functional coverage for end-to-end unsetting default template via public API.
test/functional/templates/SetTemplateAsDefault.test.ts	Functional coverage for end-to-end setting default template via public API.
src/templates/infra/repositories/TemplatesRepository.ts	Implements POST/DELETE calls to Dataverse default-template endpoints.
src/templates/index.ts	Exposes new use cases from the templates module.
src/templates/domain/useCases/UnsetTemplateAsDefault.ts	New use case wiring to repository for unsetting default.
src/templates/domain/useCases/SetTemplateAsDefault.ts	New use case wiring to repository for setting default.
src/templates/domain/repositories/ITemplatesRepository.ts	Extends repository contract with set/unset default methods.
docs/useCases.md	Documents new templates write use cases and example calls.
CHANGELOG.md	Notes new use cases/repository support for default-template endpoints.

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