feat: allow forge coverage to reuse build/test artifacts

[vbidin]

Component

Forge

Describe the feature you would like

Checking for code coverage is done by running forge coverage which always compiles contracts and runs tests. This means that even if the contracts were already compiled and/or tested (for example as part of a previous step in a CI pipeline) they will be processed again. Enabling forge coverage to use existing build artifacts and to run during forge test could prevent duplicate work from being carried out and make code coverage checks run faster.

Additional context

No response

[zerosnacks]

Hi @vbidin thanks for your suggestion

Unfortunately forge coverage always must run with optimizations disabled whereas tests by default run with optimization enabled (related: #2486). We are looking at disabling optimizations by default which should make this possible but has other trade-offs (like stack to deep).

Going to mark this as a duplicate of #8889, feel free to participate in that conversation as it aims to resolve the same issue