Fix L1 fee handling in tests

[karlb]

Celo's op-geth sets the L1 fees to zero. This works, but just by itself it is not consistent with other sources of L1 fee information. See https://github.com/celo-org/celo-blockchain-planning/issues/513.

This inconsistency breaks tests that have been recently added to the optimism repo. These L1 fee related parts of the test suite are therefore disabled at the moment. See

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We should make all results consistent and reenable the tests. Here are some commits from the previous attempt for inspiration:

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