Pass -vv to pip install build env subprocess #12578
                
     Merged
            
            
          
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Fixes #12577
This looks like it was an oversight in #9450 - we should pass the correct verbosity level to build env install subprocesses.
Tested with:
and all three verbosity levels, before and after this change, giving the following logs:
i.e. currently a lot of useful logs are being dropped from these install subprocesess even with -vvv