fix(kl-factory): base token ether tests

[juan518munoz]

What ❔

Adapt ethers tests so they work when usyng any token as base (using kl-factory base token implementation).

Why ❔

Improve test coverage.

Fixes: EVM-555

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• Code has been formatted via zk fmt and zk lint.

[juan518munoz]

@mm-zk external node integration tests should now be working.

[mm-zk]

@juan518munoz - it is still failing:

  ● ERC20 contract checks › Should claim failed deposit

    expect(received).toBeAccepted(expected)

    Transaction was expected to pass, but it failed. Details:
     [Error: invalid address (argument="address", value="0x87fa08e257bdc0f1f8bd6504467ce5c0df9bc1", code=INVALID_ARGUMENT, version=address/5.7.0)]

      197 |         await waitUntilBlockFinalized(alice, l2TxReceipt.blockNumber);
      198 |         // Claim failed deposit.
    > 199 |         await expect(alice.claimFailedDeposit(l2Hash)).toBeAccepted();
          |                                                        ^
      200 |         await expect(alice.getBalanceL1(tokenDetails.l1Address)).resolves.bnToBeEq(initialBalance);
      201 |     });
      202 |

      at Object.<anonymous> (tests/erc20.test.ts:199:56)
      ```

[juan518munoz]

@mm-zk what are the steps to reproduce? I didn't find anything specific about running tests using the extenarl node on the README, so I'm currently testing this way:

Terminal 1
Start base token implementation and server:

rm -rf volumes && zk && zk clean --all && zk env dev && zk config compile dev --diff 0 && zk init --base-token-name BAT && zk server

Terminal 2
Start external node:

zk env ext-node && ZKSYNC_ENV=ext-node zk db reset && zk external-node

Terminal 3
Run tests with ext-node environment:

zk env ext-node && zk test i server

output:

 PASS  tests/base-token.test.ts
 PASS  tests/erc20.test.ts
 PASS  tests/system.test.ts
 PASS  tests/l1.test.ts
 PASS  tests/self-unit.test.ts
 PASS  tests/api/debug.test.ts
 PASS  tests/api/contract-verification.test.ts
 PASS  tests/paymaster.test.ts
 PASS  tests/contracts.test.ts
 PASS  tests/mempool.test.ts
 PASS  tests/api/web3.test.ts
 PASS  tests/custom-account.test.ts

Test Suites: 1 skipped, 13 passed, 13 of 14 total
Tests:       3 skipped, 132 passed, 135 total