test all rust crates for realsies
After we merged legacy/trac#23881, it seems the tests in the `tor_log` crate aren't being run because there's an array in `src/test/test_rust.sh` that we didn't add the crate name to. I propose making that shell script automatically find the crates available and run their tests, e.g. ``` manifests=`find ${abs_top_srcdir:-.}/src/rust/ -mindepth 2 -maxdepth 2 -name 'Cargo.toml'` ``` (Currently, we're only running tests for `crates="protover tor_util smartlist tor_allocate"`.) As a side-note, I also think we should be calling cargo with --verbose so that our test logs actually tell us when something's wrong, e.g. for legacy/trac#24795 it would help.
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