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).

• Prettier
• Cargo sort
• Format
• Format example READMEs
  • Main README
  • Individual READMEs
• Format util READMEs
• Check lockfiles
• Check licenses
• shellcheck:

  dylint/.github/workflows/ci.yml

  Line 78 in 7fd2c4d

  run: shellcheck --exclude=SC2002 scripts/*

• lint.sh script:

  dylint/.github/workflows/ci.yml

  Line 111 in 7fd2c4d

  run: ./scripts/lint.sh

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

The new tests should probably go in ci.rs.

[smoelius]

#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:

  dylint/.github/workflows/ci.yml

  Line 144 in 879ba26

  cargo install cargo-rdme || true

• 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:

  dylint/cargo-dylint/tests/ci.rs

  Lines 125 to 138 in 879ba26

  	#[test]
  	fn format_util_readmes() {
  	preserves_cleanliness("format_util_readmes", false, || {
  	for entry in read_dir("utils").unwrap() {
  	let entry = entry.unwrap();
  	let path = entry.path();
  	Command::new("cargo")
  	.arg("rdme")
  	.current_dir(path)
  	.assert()
  	.success();
  	}
  	});
  	}