chore(dash-spv): replaced helper funcs in some tests with test-utils dummy helpers

[ZocoLini]

Summary by CodeRabbit

• Tests
  • Simplified test infrastructure by consolidating setup procedures and removing redundant helper functions.
  • Improved test maintainability through consistent use of batch-generation utilities across test suites.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Test code refactoring that replaces manual mock header construction with batch constructor methods (BlockHeader::dummy_batch and FilterHeader::dummy_batch), introduces a fixed TIP_HEIGHT constant, removes obsolete helper functions, and simplifies test setup across two test files.

Changes

Cohort / File(s)	Summary
Test Setup Simplification dash-spv/tests/edge_case_filter_sync_test.rs, dash-spv/tests/filter_header_verification_test.rs	Replaced manual header/filter-header construction with batch constructor methods; consolidated setup to use TIP_HEIGHT constant; removed helper functions (create_test_headers_range); updated test assertions and imports accordingly

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 With batch constructors, tests now bloom so bright,
No more manual mocks—just helpers done right,
TIP_HEIGHT stands tall, a constant so true,
Simpler setup means less work to review! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: replacing manual helper functions in tests with pre-existing test-utils dummy helpers (BlockHeader::dummy_batch and FilterHeader::dummy_batch).
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

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