Revert "diagnostic: also don't check Jenkins core branch."
Revert "diagnostic: also don't check Jenkins core branch."

This reverts commit db41f9d1182ff8c4c3b42b458e38d5c58b496ffb.

alyssais/brew,konqui/brew,mahori/brew,EricFromCanada/brew,maxim-belkin/brew,DomT4/brew,ilovezfs/brew,nandub/brew,vitorgalvao/brew,konqui/brew,mgrimes/brew,reelsense/brew,EricFromCanada/brew,DomT4/brew,reelsense/brew,alyssais/brew,mahori/brew,claui/brew,jmsundar/brew,sjackman/homebrew,pseudocody/brew,Homebrew/brew,Homebrew/brew,Linuxbrew/brew,EricFromCanada/brew,MikeMcQuaid/brew,nandub/brew,Linuxbrew/brew,MikeMcQuaid/brew,jmsundar/brew,ilovezfs/brew,maxim-belkin/brew,JCount/brew,JCount/brew,aw1621107/brew,hanxue/linuxbrew,pseudocody/brew,reitermarkus/brew,palxex/brew,aw1621107/brew,reelsense/brew,mahori/brew,palxex/brew,Homebrew/brew,ilovezfs/brew,nandub/brew,pseudocody/brew,MikeMcQuaid/brew,sjackman/homebrew,jmsundar/brew,sjackman/homebrew,vitorgalvao/brew,sjackman/homebrew,nandub/brew,konqui/brew,JCount/brew,mgrimes/brew,Homebrew/brew,mahori/brew,Linuxbrew/brew,hanxue/linuxbrew,DomT4/brew,konqui/brew,alyssais/brew,maxim-belkin/brew,reitermarkus/brew,claui/brew,palxex/brew,hanxue/linuxbrew,vitorgalvao/brew,reitermarkus/brew,JCount/brew,aw1621107/brew,mgrimes/brew,EricFromCanada/brew,vitorgalvao/brew,claui/brew,claui/brew,MikeMcQuaid/brew,DomT4/brew,Linuxbrew/brew,reitermarkus/brew