chore: remove duplicate benchmark tox environment

Author: spencer-tb

tox.ini

@@ -135,24 +135,6 @@ commands =
         {posargs} \
         tests
 
-[testenv:benchmark]
-description = Fill the benchmark tests using geth evm (with Python)
-passenv =
-    EVM_BIN
-commands =
-    fill \
-        --generate-all-formats \
-        --gas-benchmark-values 1 \
-        --evm-bin={env:EVM_BIN:evm} \
-        -m "benchmark and not state_test" \
-        -n auto --maxprocesses 10 --dist=loadgroup \
-        --basetemp="{temp_dir}/pytest" \
-        --log-to "{toxworkdir}/logs" \
-        --clean \
-        --fork Osaka \
-        {posargs} \
-        tests/benchmark
-
 [testenv:optimized]
 description = Run unit tests for optimized state and ethash
 passenv =