Rework the functionality of PIP_CONFIG_FILE #11850
Merged
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Fixes #11815. Properly document that
PIP_CONFIG_FILE
will override all other config files. Also make a minor modification and documentation change toiter_config_files
to have the order match the override order.I also documented the fact that setting
PIP_CONFIG_FILE
prevents the user config file from being loaded. This feels like very weird behaviour to me, but has probably existed for too long to change at this point.