Add a verification check to printchplenv to catch build system misconfigurations
#26477
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This PR adds a prototypical new flag to
printchplenv,--verify. This will run verification passes on the current Chapel configuration.This PR implements a few of these verification checks, the primary ones being checking that the host and target compilers work properly. This can help users diagnose issues with their toolchain, like #24819
This PR also turns the verification on by default when
printchplenvis invoked frommake, but does not abort the build.