Add ability to treat Python requirement warnings as errors #742
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*** WIP ***
Since we removed the use of an outdated Python requirements parsing library and move to accepting requirements following the PEP508 standard, a bad requirement is no longer silently ignored and passed to
pip, which should error. However, a user may wish to catch the warning/error earlier in theintrospectphase (or via the CLI command).This change adds a new
--warning-is-erroroption on theintrospectcommand. It can be passed as a build arg (INTROSPECT_OPTS) in the EE to allow the user to turn allintrospectwarnings on non-PEP508 compliant entries (even those that may be valid when passed along topip) into errors.