test only relevant packages for subnet-evm

[ceyonur]

Why this should be merged

The check was too strict, it should only cover those potentially can be imported from subnet-evm

How this works

relaxes the test by only checking:

• direct tests package
• direct tests/antithesis package
• tests/fixture and subpackages

How this was tested

UT

Need to be documented in RELEASES.md?

no

[Copilot]

Pull Request Overview

This PR relaxes the import validation rules for the test packages to be more specific about which packages should not import certain coreth-related libraries. Instead of broadly restricting all test packages, it now only restricts specific test directories that could potentially be imported by subnet-evm.

• Extracts forbidden import paths into a reusable slice for better maintainability
• Replaces the broad tests/... restriction with specific restrictions for tests/, tests/antithesis/, and tests/fixture/...

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