Convert GitHub workflow tests to Rust tests

[smoelius]

Do more with Rust tests and less with Yaml/Bash.

The point is to make more tests runnable via cargo test (not to use Rust for Rust's sake).

• [x] Prettier
• [x] Cargo sort
• [ ] Format
• [ ] Format example READMEs
  • [ ] Main README
  • [ ] Individual READMEs
• [x] Format util READMEs
• [x] Check lockfiles
• [x] Check licenses
• [ ] shellcheck: https://github.com/trailofbits/dylint/blob/7fd2c4d410eb0b7744f26c224e1eb3c23083e551/.github/workflows/ci.yml#L78
• [ ] lint.sh script: https://github.com/trailofbits/dylint/blob/7fd2c4d410eb0b7744f26c224e1eb3c23083e551/.github/workflows/ci.yml#L111

Necessist uses this approach, e.g., for checking licenses and checking lockfiles.

The new tests should probably go in ci.rs.

[smoelius]

https://github.com/trailofbits/dylint/pull/1077 is a recent example of such a conversion. Here is a summary of its changes:

• Installation of cargo-rdme was moved from the lint step to the test step: https://github.com/trailofbits/dylint/blob/879ba2626d28beabdc6c0ff0c482c81b20a54f61/.github/workflows/ci.yml#L144
• Invocation of update_util_READMEs.sh was removed from the lint step.
• update_util_READMEs.sh was removed altogether.
• update_util_READMEs.sh's functionality was duplicated in a test. The bulk of the logic is in a closure that is passed to preserves_cleanliness: https://github.com/trailofbits/dylint/blob/879ba2626d28beabdc6c0ff0c482c81b20a54f61/cargo-dylint/tests/ci.rs#L125-L138