Fix bugs in milestone contributor script (#7545)
Fix bugs in milestone contributor script (#7545)

* Only check PRs in milestone contributor script

* Fix no-pagination bug

mghosh4/druid,nishantmonu51/druid,leventov/druid,Fokko/druid,himanshug/druid,Fokko/druid,mghosh4/druid,deltaprojects/druid,knoguchi/druid,Fokko/druid,jon-wei/druid,pjain1/druid,Fokko/druid,monetate/druid,gianm/druid,jon-wei/druid,deltaprojects/druid,implydata/druid,Fokko/druid,implydata/druid,Fokko/druid,gianm/druid,leventov/druid,deltaprojects/druid,monetate/druid,nishantmonu51/druid,knoguchi/druid,leventov/druid,nishantmonu51/druid,leventov/druid,michaelschiff/druid,jon-wei/druid,mghosh4/druid,gianm/druid,leventov/druid,Fokko/druid,mghosh4/druid,implydata/druid,nishantmonu51/druid,monetate/druid,nishantmonu51/druid,deltaprojects/druid,mghosh4/druid,michaelschiff/druid,knoguchi/druid,michaelschiff/druid,pjain1/druid,implydata/druid,druid-io/druid,deltaprojects/druid,druid-io/druid,monetate/druid,nishantmonu51/druid,druid-io/druid,gianm/druid,monetate/druid,jon-wei/druid,pjain1/druid,jon-wei/druid,himanshug/druid,implydata/druid,gianm/druid,himanshug/druid,michaelschiff/druid,druid-io/druid,deltaprojects/druid,knoguchi/druid,mghosh4/druid,monetate/druid,nishantmonu51/druid,michaelschiff/druid,gianm/druid,gianm/druid,deltaprojects/druid,monetate/druid,pjain1/druid,mghosh4/druid,jon-wei/druid,knoguchi/druid,pjain1/druid,himanshug/druid,michaelschiff/druid,jon-wei/druid,himanshug/druid,pjain1/druid,druid-io/druid,implydata/druid,pjain1/druid,michaelschiff/druid