Partly revert #32231
Partly revert #32231

- Remove extra execution of `perform_enqueued_jobs`
  since it performs all enqueued jobs in the duration of the block.
- Fix example of using `assert_emails` without block since we
  can't use enqueued jobs in this case.

tjschuck/rails,repinel/rails,iainbeeston/rails,aditya-kapoor/rails,aditya-kapoor/rails,illacceptanything/illacceptanything,MSP-Greg/rails,assain/rails,assain/rails,joonyou/rails,mohitnatoo/rails,shioyama/rails,aditya-kapoor/rails,palkan/rails,yawboakye/rails,assain/rails,georgeclaghorn/rails,yawboakye/rails,pvalena/rails,flanger001/rails,iainbeeston/rails,repinel/rails,schuetzm/rails,yahonda/rails,mechanicles/rails,starknx/rails,flanger001/rails,BlakeWilliams/rails,tjschuck/rails,kddeisz/rails,bogdanvlviv/rails,MSP-Greg/rails,Envek/rails,bogdanvlviv/rails,bogdanvlviv/rails,untidy-hair/rails,MSP-Greg/rails,schuetzm/rails,georgeclaghorn/rails,kmcphillips/rails,yalab/rails,rails/rails,utilum/rails,kddeisz/rails,betesh/rails,deraru/rails,vipulnsward/rails,Edouard-chin/rails,starknx/rails,kmcphillips/rails,palkan/rails,illacceptanything/illacceptanything,utilum/rails,yhirano55/rails,illacceptanything/illacceptanything,untidy-hair/rails,EmmaB/rails-1,BlakeWilliams/rails,iainbeeston/rails,arunagw/rails,utilum/rails,eileencodes/rails,fabianoleittes/rails,illacceptanything/illacceptanything,flanger001/rails,yalab/rails,mechanicles/rails,aditya-kapoor/rails,illacceptanything/illacceptanything,gauravtiwari/rails,joonyou/rails,shioyama/rails,utilum/rails,joonyou/rails,notapatch/rails,mechanicles/rails,esparta/rails,Envek/rails,Vasfed/rails,BlakeWilliams/rails,iainbeeston/rails,BlakeWilliams/rails,palkan/rails,bogdanvlviv/rails,tgxworld/rails,Vasfed/rails,Erol/rails,travisofthenorth/rails,travisofthenorth/rails,repinel/rails,vipulnsward/rails,tjschuck/rails,Envek/rails,fabianoleittes/rails,travisofthenorth/rails,eileencodes/rails,Edouard-chin/rails,Vasfed/rails,yalab/rails,gauravtiwari/rails,schuetzm/rails,rafaelfranca/omg-rails,yhirano55/rails,rails/rails,EmmaB/rails-1,printercu/rails,Stellenticket/rails,Edouard-chin/rails,yalab/rails,yawboakye/rails,assain/rails,georgeclaghorn/rails,rafaelfranca/omg-rails,mohitnatoo/rails,baerjam/rails,illacceptanything/illacceptanything,betesh/rails,esparta/rails,esparta/rails,pvalena/rails,fabianoleittes/rails,untidy-hair/rails,untidy-hair/rails,notapatch/rails,shioyama/rails,pvalena/rails,printercu/rails,lcreid/rails,schuetzm/rails,illacceptanything/illacceptanything,illacceptanything/illacceptanything,Erol/rails,tjschuck/rails,prathamesh-sonpatki/rails,flanger001/rails,deraru/rails,illacceptanything/illacceptanything,mohitnatoo/rails,illacceptanything/illacceptanything,baerjam/rails,starknx/rails,tgxworld/rails,Erol/rails,printercu/rails,yahonda/rails,mohitnatoo/rails,Edouard-chin/rails,mechanicles/rails,yhirano55/rails,MSP-Greg/rails,deraru/rails,printercu/rails,kddeisz/rails,prathamesh-sonpatki/rails,lcreid/rails,arunagw/rails,rails/rails,gauravtiwari/rails,prathamesh-sonpatki/rails,lcreid/rails,rafaelfranca/omg-rails,kddeisz/rails,prathamesh-sonpatki/rails,jeremy/rails,joonyou/rails,shioyama/rails,yawboakye/rails,tgxworld/rails,jeremy/rails,lcreid/rails,illacceptanything/illacceptanything,betesh/rails,baerjam/rails,palkan/rails,yahonda/rails,kmcphillips/rails,vipulnsward/rails,pvalena/rails,esparta/rails,yhirano55/rails,notapatch/rails,illacceptanything/illacceptanything,baerjam/rails,tgxworld/rails,vipulnsward/rails,Envek/rails,arunagw/rails,EmmaB/rails-1,Erol/rails,eileencodes/rails,jeremy/rails,Vasfed/rails,Stellenticket/rails,georgeclaghorn/rails,illacceptanything/illacceptanything,kmcphillips/rails,notapatch/rails,Stellenticket/rails,travisofthenorth/rails,betesh/rails,rails/rails,yahonda/rails,illacceptanything/illacceptanything,Stellenticket/rails,jeremy/rails,arunagw/rails,deraru/rails,illacceptanything/illacceptanything,eileencodes/rails,fabianoleittes/rails,repinel/rails