fix(tests): add style tag once
fix(tests): add style tag once

- Add style tag once to avoid multiplied DOM creation

Closes #5557
Fixes #5548

wesleycho/bootstrap,caoruiy/bootstrap,fpipita/bootstrap,RobJacobs/bootstrap,mabi/bootstrap,BookingBug/bootstrap,BookingBug/bootstrap,292388900/bootstrap,fpipita/bootstrap,benhalverson/bootstrap,Foxandxss/bootstrap,Kpler/bootstrap,christor/bootstrap,byronigoe/bootstrap,caoruiy/bootstrap,icfantv/bootstrap,RobJacobs/bootstrap,Servoy/bootstrap,Kpler/bootstrap,benhalverson/bootstrap,christor/bootstrap,icfantv/bootstrap,vfiles/bootstrap,Foxandxss/bootstrap,mabi/bootstrap,Servoy/bootstrap,shootermv/bootstrap,vfiles/bootstrap,angular-ui/bootstrap,benhalverson/bootstrap,wesleycho/bootstrap,angular-ui/bootstrap,byronigoe/bootstrap,looker/bootstrap,looker/bootstrap,shootermv/bootstrap,292388900/bootstrap,benhalverson/bootstrap