Remove TestCase type hint in FixtureManager.
Remove TestCase type hint in FixtureManager.

Enforcing the `Cake\TestSuite\TestCase` type of argument was blocking further integration with other testing frameworks (i.e. codeception).
elboletaire/cakephp,nrother/cakephp,CakeDC/cakephp,dkarvounaris/cakephp,khoimt/cakephp-study,pbaire/cakephp,yinhe007/cakephp,mvdriel/cakephp,petteyg/cakephp,khoimt/cakephp-study,cakephp-fr/cakephp,petteyg/cakephp,jeffblack360/cakephp,davidyell/cakephp,petteyg/cakephp,Balachan27/cakephp,kumamidori/cakephp,thinkingmedia/cakephp,ADmad/cakephp,bravo-kernel/cakephp,pbaire/cakephp,berrygoudswaard/cakephp,michaelze/cakephp,pbaire/cakephp,timhoeppner/cakephp,eryw/cakephp,justinyost/cakephp,dakota/cakephp,cakephp/cakephp,akintoey/cakephp,CakeDC/cakephp,adopico/cakephp,HavokInspiration/cakephp,akintoey/cakephp,adopico/cakephp,thinkingmedia/cakephp,CakeDC/cakephp,burriko/cakephp,justinyost/cakephp,davidyell/cakephp,eboominathan/cakephp,akintoey/cakephp,erikfig/cakephp,ndm2/cakephp,eryw/cakephp,Phillaf/cakephp,cakephp-fr/cakephp,HavokInspiration/cakephp,Phillaf/cakephp,petteyg/cakephp,ADmad/cakephp,nrother/cakephp,CVO-Technologies/cakephp,tisu2tisu/cakephp,ADmad/cakephp,yinhe007/cakephp,garethellis36/cakephp,bravo-kernel/cakephp,adopico/cakephp,gmponos/cakephp,CVO-Technologies/cakephp,burriko/cakephp,jeffblack360/cakephp,tisu2tisu/cakephp,mvdriel/cakephp,garethellis36/cakephp,garethellis36/cakephp,davidyell/cakephp,garethellis36/cakephp,kumamidori/cakephp,elboletaire/cakephp,cakephp/cakephp,mvdriel/cakephp,dkarvounaris/cakephp,jerems02/cakephp,cakephp/cakephp,justinyost/cakephp,tgr0ss/cakephp,CVO-Technologies/cakephp,ndm2/cakephp,ionas/cakephp,jerems02/cakephp,gmponos/cakephp,mvdriel/cakephp,ndm2/cakephp,berrygoudswaard/cakephp,tisu2tisu/cakephp,burriko/cakephp,CakeDC/cakephp,gmponos/cakephp,tenkoma/cakephp,web-player/cakephp,cakephp/cakephp,Balachan27/cakephp,web-player/cakephp,erikfig/cakephp,dakota/cakephp,thinkingmedia/cakephp,ADmad/cakephp,yinhe007/cakephp,timhoeppner/cakephp,tenkoma/cakephp,cakephp-fr/cakephp,ndm2/cakephp,dkarvounaris/cakephp,michaelze/cakephp,jerems02/cakephp,bravo-kernel/cakephp,erikfig/cakephp,Phillaf/cakephp,tgr0ss/cakephp,HavokInspiration/cakephp,jjj117/cakephp,elboletaire/cakephp,tenkoma/cakephp,ionas/cakephp,dakota/cakephp,Balachan27/cakephp,timhoeppner/cakephp,jjj117/cakephp,ionas/cakephp,jeffblack360/cakephp,dakota/cakephp,web-player/cakephp,michaelze/cakephp,tgr0ss/cakephp,jjj117/cakephp,eboominathan/cakephp,eryw/cakephp,tenkoma/cakephp,berrygoudswaard/cakephp,nrother/cakephp,khoimt/cakephp-study,kumamidori/cakephp,eboominathan/cakephp