update-report: migrate all formulae every time.
update-report: migrate all formulae every time.

Unmigrated formulae cause hard-to-debug issues and relying on detection
on Git alone is faster but not comprehensive. Instead, iterate through
renamed, installed formulae every time and migrate them.

Closes #1770.

MikeMcQuaid/brew,gregory-nisbet/brew,Homebrew/brew,reitermarkus/brew,sjackman/homebrew,rwhogg/brew,nandub/brew,MikeMcQuaid/brew,bfontaine/brew,DomT4/brew,jmsundar/brew,sjackman/homebrew,amar-laksh/brew_sudo,MikeMcQuaid/brew,DomT4/brew,mgrimes/brew,aw1621107/brew,zmwangx/brew,ilovezfs/brew,tonyg/homebrew,claui/brew,reelsense/brew,palxex/brew,JCount/brew,tonyg/homebrew,vitorgalvao/brew,ilovezfs/brew,nandub/brew,amar-laksh/brew_sudo,reelsense/brew,aw1621107/brew,bfontaine/brew,reitermarkus/brew,reitermarkus/brew,muellermartin/dist,maxim-belkin/brew,nandub/brew,hanxue/linuxbrew,JCount/brew,Linuxbrew/brew,ilovezfs/brew,zmwangx/brew,konqui/brew,pseudocody/brew,MikeMcQuaid/brew,Linuxbrew/brew,maxim-belkin/brew,EricFromCanada/brew,pseudocody/brew,konqui/brew,mahori/brew,DomT4/brew,rwhogg/brew,konqui/brew,aw1621107/brew,hanxue/linuxbrew,DomT4/brew,mahori/brew,alyssais/brew,Homebrew/brew,konqui/brew,mgrimes/brew,alyssais/brew,Homebrew/brew,Linuxbrew/brew,JCount/brew,Linuxbrew/brew,tonyg/homebrew,alyssais/brew,mahori/brew,nandub/brew,amar-laksh/brew_sudo,EricFromCanada/brew,Homebrew/brew,jmsundar/brew,vitorgalvao/brew,gregory-nisbet/brew,muellermartin/dist,palxex/brew,zmwangx/brew,reelsense/brew,pseudocody/brew,EricFromCanada/brew,bfontaine/brew,mgrimes/brew,mahori/brew,vitorgalvao/brew,hanxue/linuxbrew,gregory-nisbet/brew,claui/brew,EricFromCanada/brew,claui/brew,claui/brew,muellermartin/dist,sjackman/homebrew,palxex/brew,rwhogg/brew,vitorgalvao/brew,maxim-belkin/brew,jmsundar/brew,sjackman/homebrew,reitermarkus/brew,JCount/brew