op-e2e: Additional Isthmus fee tests

[sebastianst]

The Isthmus Operator Fee is implemented in

• isthmus: operator fee op-geth#388
• isthmus: operator fee #12166

We need additional testing to call these implementations production ready, so extend the existing
op-e2e/actions/proofs/operator_fee_test.go tests to have

• have a transaction which causes a state refund (e.g. SSTORE that sets a storage location that is currently >0 to 0).
• have a user deposit tx, so that we can assert how user deposit txs are charged (and that the operator fee vault doesn't get the fees in this case)
• cover the Isthmus transition block, because of the special case of it isthmus: operator fee op-geth#388 (comment).

Ideally the existing tests are parameterized to cover different scenarios, instead of copy-pasting.

It should also be explored in how far the existing fees test in op-e2e/system/fees/fees_test.go can be moved into the actions/proofs package and be made a proofs test, and replace the above test. Those tests already employ parameterization. Maybe it's worth adding an additional parameter for the state refund and user deposit scenarios.

[tynes]

Noting for future follow ups:

• isthmus: operator fee #12166 (comment)
• isthmus: operator fee #12166 (comment)

[tynes]

@leruaa do you mind owning this?

[leruaa]

@tynes Yes I will