fix[venom]: fix eval of exp in sccp

[charles-cooper]

What I did

How I did it

How to verify it

Commit message

fix `exp` evaluation in sccp. the current implementation is incorrect,
which was found by enabling the `venom + -opt-none` pipeline in the CI.
`evm_pow` is correct, as it preserves the correct edge cases when
base/exponent are 0 or 1 (all combinations).

this commit also enables the `venom + -opt-none` and
`venom + -opt-codesize` jobs in the CI, ensuring higher coverage of the
venom pipeline going forward.

Description for the changelog

Cute Animal Picture

[DanielSchiavini]

Double negatives are unnecessarily hard to read