Ruby: Fix QL tests and Rust compilation error

[aibaars]

For some reason the rust compiler on linux started complaining about the following while accepting the code on windows and osx. I suspect this is due to a newer version of rust on the actions-virtualenvironments .

error[E0282]: type annotations needed
   --> node-types/src/lib.rs:103:9
    |
103 |     let iter = node_types.iter().map(convert_type).collect();
    |         ^^^^ consider giving `iter` a type

For more information about this error, try `rustc --explain E0282`.

See also: https://github.com/github/codeql/actions/runs/1412583767

In addition this pull request fixes the dbscheme upgrades tests that started failing. I wonder why they ever worked because the path supplied to --additional-packs is not a root folder of a pack (it's a subfolder). I suppose the codeql CLI has gotten more strict. Failed job here: https://github.com/aibaars/codeql/runs/4079041121?check_suite_focus=true

Finally this pull request adds the workflow paths to the paths section of push and pull_request triggers to ensure they are run whenever we change the workflows.

[nickrolfe]

LGTM.

I can reproduce the Rust error on mac OS with the latest rustc (1.56.1). Note that the same fix was already made on main when we fixed all the problems reported by cargo clippy. I hope it'll merge back cleanly, since they are identical changes.