Coalesce integration tests

Currently, we have multiple sets of integration tests with names like `named_bounds_foo` and `named_bounds_bar` which are *logically* grouped but live in distinct areas. This makes it difficult to navigate integration tests, and increases the *number* of integration tests overall.

Now that our `hermes.toml` integration test manifest format supports multiple "phases", we should group these so that integration tests are easier to navigate.