env: add --default-signal, --block-signal, and --list-signal-handling options #9658
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Now that there's a mechanism for us to read the pipeline signals, I wanted to get started on the ability to add that capability to env for better testing. #9657 this is the PR that implements the macro in signal handling that allows for reading the pipeline signals.
With these two PR's combined the gnu env signal test passes. I want to add more integration tests in here but I need to wait until the pipeline signal reader macro is in some of our utilities to be able to use our utilities in the testing to validate that it matches the expectations in the GNU tests.