chore(test-tests): Fix EIP-7934 and EIP-7623 for Amsterdam (ethereum#2252)

* fix: make eip-7934 block-size filler fork-aware for amsterdam by enforcing tx gas caps and adaptive calldata sizing so --until=amsterdam fills pass

* fix: eip-7623 refund test gas selection to enforce strict > data floor across amsterdam refund-boundary cases

* fix: mypy

* fix: spencer feedback

Author: felix314159