Required new tests due to max gas limit reduction

[marioevz]

Includes a list of tests that have to be enhanced or implemented due to the max transaction gas limit rendering some static tests unable to run:

• tests/static/state_tests/Cancun/stEIP1153_transientStorage/21_tstoreCannotBeDosdOOOFiller.yml: Test tests/benchmark/test_worst_compute.py::test_worst_tstore needs to add a small change so the key to the TSTORE operation keeps swapping between values closer to 2**256 and values closer to 0 (need to add Op.SUB(0, Op.GAS) to the key on top of simple Op.GAS).
• New test to tests/benchmark/test_worst_blocks.py with blocks full of authorizations.
• New benchmark test to max out blake2 usage in multiple transactions (see tests/istanbul/eip152_blake2/test_blake2.py::test_blake2b_gas_limit)
• Port tests/prague/eip2537_bls_12_381_precompiles/test_bls12_pairing.py to a multi-tx benchmark test.

[marioevz]

Two last bullet points have been fixed by ethereum/execution-spec-tests#1928, but the other two seem unrelated.