[hail] remove ./gradlew pipInstall (#6286)
[hail] remove ./gradlew pipInstall (#6286)

This no longer works.
hail-is/hail,danking/hail,danking/hail,hail-is/hail,cseed/hail,cseed/hail,hail-is/hail,danking/hail,cseed/hail,cseed/hail,cseed/hail,danking/hail,hail-is/hail,hail-is/hail,danking/hail,danking/hail,cseed/hail,hail-is/hail,hail-is/hail,danking/hail,cseed/hail,hail-is/hail,cseed/hail,danking/hail