minor #25749 Prefer composer install instead for using Symfony Installer (e-moe)
minor #25749 Prefer composer install instead for using Symfony Installer (e-moe)

This PR was submitted for the master branch but it was merged into the 3.4 branch instead (closes #25749).

Discussion
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Prefer composer install instead for using Symfony Installer

Looks like Symfony Installer should be replaced by `composer create-project` (flex)

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yno
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

Commits
-------

d9b135d11b Prefer composer install instead for using Symfony Installer

Slamdunk/symfony,chalasr/symfony,dmaicher/symfony,vincentaubert/symfony,gimler/symfony,kbond/symfony,Koc/symfony,Tobion/symfony,shieldo/symfony,mweimerskirch/symfony,Deamon/symfony,jvasseur/symfony,oleg-andreyev/symfony,sgehrig/symfony,curry684/symfony,nicolas-grekas/symfony,sroze/symfony,pyrech/symfony,dmaicher/symfony,tgalopin/symfony,derrabus/symfony,andreia/symfony,Taluu/symfony,mnapoli/symfony,derrabus/symfony,nicolas-grekas/symfony,Deamon/symfony,Einenlum/symfony,michaelperrin/symfony,Deamon/symfony,1ed/symfony,localheinz/symfony,damienalexandre/symfony,pierredup/symfony,sgehrig/symfony,e-moe/symfony,hacfi/symfony,pyrech/symfony,tgalopin/symfony,deguif/symfony,gonzalovilaseca/symfony,pamil/symfony,mpdude/symfony,OskarStark/symfony,Taluu/symfony,d-ph/symfony,paradajozsef/symfony,HeahDude/symfony,1ed/symfony,mweimerskirch/symfony,jakzal/symfony,iltar/symfony,ro0NL/symfony,garak/symfony,gonzalovilaseca/symfony,teohhanhui/symfony,Deamon/symfony,vincentaubert/symfony,gimler/symfony,gimler/symfony,curry684/symfony,oleg-andreyev/symfony,bendavies/symfony,ragboyjr/symfony,jderusse/symfony,hacfi/symfony,tucksaun/symfony,alekitto/symfony,mnapoli/symfony,nicolas-grekas/symfony,zorn-v/symfony,sroze/symfony,sroze/symfony,lyrixx/symfony,tucksaun/symfony,pierredup/symfony,dmaicher/symfony,phramz/symfony,andreia/symfony,fabpot/symfony,zcodes/symfony,nicolas-grekas/symfony,jderusse/symfony,alekitto/symfony,iltar/symfony,mweimerskirch/symfony,xabbuh/symfony,MatTheCat/symfony,zorn-v/symfony,romaricdrigon/symfony,andreia/symfony,yceruto/symfony,yceruto/symfony,ajgarlag/symfony,paradajozsef/symfony,bendavies/symfony,Koc/symfony,d-ph/symfony,1ed/symfony,xabbuh/symfony,Pierstoval/symfony,ro0NL/symfony,mpdude/symfony,iltar/symfony,localheinz/symfony,andrerom/symfony,symfony/symfony,Slamdunk/symfony,Einenlum/symfony,garak/symfony,voronkovich/symfony,gnat42/symfony,smatyas/symfony,Slamdunk/symfony,voronkovich/symfony,Simperfit/symfony,HeahDude/symfony,lstrojny/symfony,andrerom/symfony,derrabus/symfony,oleg-andreyev/symfony,localheinz/symfony,smatyas/symfony,dmaicher/symfony,Nyholm/symfony,OskarStark/symfony,arjenm/symfony,apetitpa/symfony,mnapoli/symfony,ragboyjr/symfony,ro0NL/symfony,derrabus/symfony,maidmaid/symfony,Slamdunk/symfony,hhamon/symfony,jderusse/symfony,e-moe/symfony,1ed/symfony,arjenm/symfony,weaverryan/symfony,Nyholm/symfony,zorn-v/symfony,yceruto/symfony,michaelperrin/symfony,stof/symfony,apetitpa/symfony,nasimnabavi/symfony,ragboyjr/symfony,sgehrig/symfony,weaverryan/symfony,docteurklein/symfony,pamil/symfony,teohhanhui/symfony,smatyas/symfony,Simperfit/symfony,maidmaid/symfony,jean-gui/symfony,zcodes/symfony,jean-gui/symfony,OskarStark/symfony,alekitto/symfony,curry684/symfony,frankdejonge/symfony,phramz/symfony,pierredup/symfony,zcodes/symfony,localheinz/symfony,chalasr/symfony,lyrixx/symfony,pyrech/symfony,gonzalovilaseca/symfony,nasimnabavi/symfony,joelwurtz/symfony,paradajozsef/symfony,ajgarlag/symfony,iltar/symfony,joelwurtz/symfony,voronkovich/symfony,Deamon/symfony,Taluu/symfony,hhamon/symfony,jakzal/symfony,weaverryan/symfony,Einenlum/symfony,shieldo/symfony,kbond/symfony,gnat42/symfony,d-ph/symfony,mnapoli/symfony,gnat42/symfony,garak/symfony,garak/symfony,ajgarlag/symfony,ogizanagi/symfony,voronkovich/symfony,zerkms/symfony,andrerom/symfony,d-ph/symfony,oleg-andreyev/symfony,andrerom/symfony,smatyas/symfony,symfony/symfony,Koc/symfony,nasimnabavi/symfony,hhamon/symfony,frankdejonge/symfony,Tobion/symfony,jakzal/symfony,ogizanagi/symfony,HeahDude/symfony,c960657/symfony,smatyas/symfony,zerkms/symfony,Simperfit/symfony,fabpot/symfony,jvasseur/symfony,tucksaun/symfony,ogizanagi/symfony,e-moe/symfony,teohhanhui/symfony,Einenlum/symfony,ogizanagi/symfony,jvasseur/symfony,stof/symfony,sgehrig/symfony,Tobion/symfony,jderusse/symfony,maidmaid/symfony,OskarStark/symfony,Pierstoval/symfony,c960657/symfony,romaricdrigon/symfony,arjenm/symfony,romaricdrigon/symfony,shieldo/symfony,Nyholm/symfony,pamil/symfony,joelwurtz/symfony,gimler/symfony,jean-gui/symfony,mpdude/symfony,symfony/symfony,MatTheCat/symfony,alekitto/symfony,pierredup/symfony,jvasseur/symfony,apetitpa/symfony,vincentaubert/symfony,nasimnabavi/symfony,teohhanhui/symfony,mweimerskirch/symfony,phramz/symfony,kbond/symfony,lstrojny/symfony,weaverryan/symfony,zorn-v/symfony,symfony/symfony,yceruto/symfony,damienalexandre/symfony,arjenm/symfony,vincentaubert/symfony,michaelperrin/symfony,andreia/symfony,curry684/symfony,fabpot/symfony,jean-gui/symfony,stof/symfony,pamil/symfony,docteurklein/symfony,ragboyjr/symfony,mnapoli/symfony,bendavies/symfony,docteurklein/symfony,MatTheCat/symfony,Tobion/symfony,lyrixx/symfony,zerkms/symfony,deguif/symfony,frankdejonge/symfony,Koc/symfony,chalasr/symfony,docteurklein/symfony,damienalexandre/symfony,Simperfit/symfony,joelwurtz/symfony,deguif/symfony,mweimerskirch/symfony,pyrech/symfony,c960657/symfony,shieldo/symfony,ajgarlag/symfony,deguif/symfony,tucksaun/symfony,e-moe/symfony,phramz/symfony,zcodes/symfony,lyrixx/symfony,apetitpa/symfony,xabbuh/symfony,hacfi/symfony,frankdejonge/symfony,gonzalovilaseca/symfony,bendavies/symfony,stof/symfony,damienalexandre/symfony,mpdude/symfony,maidmaid/symfony,fabpot/symfony,tgalopin/symfony,kbond/symfony,ro0NL/symfony,HeahDude/symfony,paradajozsef/symfony,michaelperrin/symfony,sroze/symfony,Nyholm/symfony,gnat42/symfony,Pierstoval/symfony,chalasr/symfony,docteurklein/symfony,c960657/symfony,zerkms/symfony,Simperfit/symfony,xabbuh/symfony,Taluu/symfony,Pierstoval/symfony,romaricdrigon/symfony,jakzal/symfony,lstrojny/symfony,hhamon/symfony,tgalopin/symfony,MatTheCat/symfony