refactor(core/vm): remove unused SetTracer helper

[gzliudan]

Proposed changes

Drop the redundant EVM tracer setter and keep tracer configuration on Config.

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• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
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• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
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[Copilot]

Pull request overview

Removes a redundant EVM tracer setter method so tracer configuration is done solely through vm.Config, simplifying the EVM API surface.

Changes:

• Deleted the (*EVM).SetTracer helper, relying on Config.Tracer instead.

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