[3.2] enable all tests for Ubuntu 22; NP & LR tests for Ubuntu 18

[spoonincode]

Now runs all tests for Ubuntu 20 & 22. Ubuntu 18 still struggles with test_trx_full so leave out its parallel tests but enable NP & LR tests.

I had to touch the parallel-ctest-containers action to fix a problem in Ubuntu 18, so I went ahead and made more changes to it:

• commit the package-lock.json so that hopefully it's easier to reproduce the minified version of the action. I regret a little committing the obfuscated minimized version but I also feel guilty committing a "large" file in to the repo. It's clearly a leap-specific action so it seems correct to remain in the leap repo. And longer term this should go away since test harness improvements are underway.
• No longer discover the NP & LR tests during the build job, just have the action find them on their own based on the label.
• Modify the workflow to only grant package write permission for the sole job that requires it. If there's something evil in that blob of javascript, well, it can't write to the repo or packages.