Pass --empty to foundry_test_utils::initialize

[DaniPopes]

We currently initialize the default test projects with the default forge init, however most of the time we wipe* the project, or just ignore these files.

We can speed up our test suite by making the default contracts opt-in instead of opt-out.

• Pass --empty to foundry_test_utils::util::initialize:

  foundry/crates/test-utils/src/util.rs

  Line 286 in 56aadcb

  cmd.args(["init", "--force"]).assert_success();

• Add fn initialize_default_contracts to TestProject for the tests that use them
• And deal with the fallout in tests.

[Peponks9]

hi @DaniPopes would like to contribute to it :)

[zerosnacks]

Thanks! Assigned @Peponks9