Forge coverage is broken

[pmerkleplant]

The ProposalFactory has a stack too-deep error.
Why this is not a problem per se, as we want to use the new --via-ir pipeline anyway (which fixes this), there is an issue with forge coverage.

Forge coverage does not support the --via-ir pipeline at the moment, meaning we cannot create coverage reports.

The best is probably to fix the stack too-deep error as we should not discard coverage reports.

For more info, see foundry-rs/foundry#3527 (comment)