Remove drupalci.yml

I think this truly marks the end of the era.

larowlan → credited alexpott → .

larowlan → credited bbrala → .

larowlan → credited catch → .

larowlan → credited el7cosmos → .

larowlan → credited fjgarlin → .

larowlan → credited longwave → .

larowlan → credited mstrelan → .

larowlan → credited nick_schuch → .

larowlan → credited poker10 → .

larowlan → credited rosk0 → .

larowlan → credited xurizaemon → .

Crediting folks who worked on gitlabci per comms with @xjm

Committed live at DrupalCon Singapore to 11.x, 11.1.x, 11.0.x, 10.5.x, 10.4.x, and 10.3.x!

Sounds like this series of issues had a journey through several Asia/Pacific events. Thanks everyone for modernizing our testing infrastructure!

xjm → closed merge request !10288

@xjm 10.4.x seems to have been missed?