fix(core/vm): remove EIP-7702 extcode overrides #31089

[gzliudan]

Proposed changes

Remove the custom EIP-7702 handlers for EXTCODECOPY, EXTCODESIZE, and EXTCODEHASH so the jump table keeps the default opcode behavior. This also drops the now-unused imports tied to delegation-specific code paths.

Ref: 31089

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Checklist

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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.
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[Copilot]

Pull request overview

This PR removes the EIP-7702-specific overrides for EXTCODESIZE, EXTCODEHASH, and EXTCODECOPY so that these opcodes retain the default EVM behavior even when EIP-7702 is enabled (i.e., they operate on the account’s actual stored code bytes, including delegation designators).

Changes:

• Removed the custom EIP-7702 EXTCODE* opcode handlers from core/vm/eips.go (and the now-unused imports they required).
• Added a runtime test asserting EXTCODESIZE, EXTCODEHASH, and EXTCODECOPY return results based on the delegation designator bytes stored at the delegated account.
• Added required test imports (bytes, crypto) to support the new assertions.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
core/vm/eips.go	Stops overriding EXTCODE* opcode execution under EIP-7702; keeps only the EIP-7702 call-related gas adjustments.
core/vm/runtime/runtime_test.go	Adds a regression test verifying default EXTCODE* behavior for delegation-designator code bytes.

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