chore(turborepo): Move SCM to use vendored wax crate (#5277)
### Description
We should have everything use the vendored wax crate to avoid confusing
issues. Also a prerequisite for #5272 because when we build all the
turborepo crates, `crates/turborepo-wax` included, cargo gets confused
about whether we mean the vendored wax crate or the upstream wax crate.
### Testing Instructions
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Co-authored-by: --global <Nicholas Yang>
