test(render): add unit tests for DatasetHandlerImpl

[sabhi128]

Summary of Changes

This PR expands backend test coverage by adding unit tests for the DatasetHandlerImpl under internal/handlers/render/.

Changes:

• New File: internal/handlers/render/datasets_test.go
  • Added route rendering coverage for:
    1. List route (datasets_index template rendering).
    2. Detail route (parameter mapping of namespace and dataset_name to datasets_show template).
    3. New route (checks context layout and license dictionary injection).

All rendering calls are tested in isolation using Mockery's testifying mocks.

[Copilot]

Pull request overview

This PR adds unit tests to improve backend rendering coverage for DatasetHandlerImpl, verifying that dataset routes invoke template rendering with expected template names and key view-model fields.

Changes:

• Added new unit test file covering List, Detail, and New routes for datasets.
• Introduced mock-based assertions around RenderTemplate calls and selected template data fields.

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