add deploy_mock_erc20_contract to test_utils

[ItayRosenberg]

Note

Adds a helper to deploy the mock ERC20 and updates TokenDeployImpl.deploy to use it.

• Testing utils (packages/testing/src/test_utils.cairo):
  • New helper: deploy_mock_erc20_contract builds calldata and deploys DualCaseERC20Mock, returning its ContractAddress.
  • Refactor: TokenDeployImpl.deploy now delegates to deploy_mock_erc20_contract instead of inlining deployment logic.

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✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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[ishay-starkware]

@ishay-starkware reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ItayRosenberg)