Auto merge of #14111 - eth3lbert:snapbox-wwy, r=epage

test: migrate weak_dep_features, workspaces and yank to snapbox

### What does this PR try to resolve?

Part of #14039.

Migrate following to snapbox:

- `tests/testsuite/weak_dep_features.rs`
- `tests/testsuite/workspaces.rs`
- `tests/testsuite/yank.rs`

Author: bors