feat: Add test helper for mocking task dependencies

[ahogappa]

Summary

• Add Taski::TestHelper module for mocking task dependencies in unit tests
• mock_task(TaskClass, key: value) to mock exported values without running tasks
• assert_task_accessed / refute_task_accessed for verifying dependency access
• Automatic isolation of indirect dependencies (only direct dependencies need mocking)
• Support for both Minitest and RSpec test frameworks
• Implementation uses Ruby's prepend to intercept task execution without modifying production code

Test plan

• Run rake test - all 352 tests pass
• Run rake standard - no style violations
• Verify mock_task works with simplified syntax mock_task(FetchData, users: [1, 2, 3])

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