refactor: use reflect.TypeFor

[slightsharp]

Description

Try to use better api reflect.TypeFor instead of reflect.TypeOf when we have known the type.
More info golang/go#60088

How Has This Been Tested?

• Tested CCTX in localnet
• Tested in development environment
• Go unit tests
• Go integration tests
• Tested via GitHub Actions

Summary by CodeRabbit

• Refactor
  • Updated internal type reflection mechanisms across test and utility modules for improved code maintainability.

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request modernizes type reflection across the codebase by replacing reflect.TypeOf() calls with the newer reflect.TypeFor[]() generic-based API, affecting configuration tests and utility nullification logic without altering control flow or functionality.

Changes

Cohort / File(s)	Summary
Type Reflection Modernization - Config e2e/config/config_test.go	Replaced reflect.TypeOf(AdditionalAccounts{}) with reflect.TypeFor[AdditionalAccounts]() to modernize type retrieval using Go generics.
Type Reflection Modernization - Nullify testutil/nullify/nullify.go	Updated three package-scope type descriptor initializations (coinType, coinsType, uintType) from reflect.TypeOf() to reflect.TypeFor[]() API calls.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'refactor: use reflect.TypeFor' accurately summarizes the primary change, clearly identifying the refactoring effort to adopt the newer reflect.TypeFor API.
Description check	✅ Passed	The description includes the required Description and How Has This Been Tested sections with appropriate detail and context. One testing option is marked as completed.
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

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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