npm / cli / #1298

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Do not print error banner for shell proxy commands

There are a few commands (exec, run-script, and the run-script proxies)
where essentially npm is acting like a very fancy shell.  It is peculiar
and noisy for npm to print a verbose error banner at the end of these
commands, since presumably the command itself already did whatever it
had to do to report the error appropriately.

For example, `npm test` runs a test script, usually outputting test
results.  Having npm then tell me that my tests failed with exit status
1 and print a debug log, is unnecessary and unwanted.

When the error encountered for these commands does not have a non-zero
numeric 'code', then we still print the standard npm error reporting
messages, because presumably something went wrong OTHER than a process
exiting with a non-zero status code.

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