Keep consistency with --dev option

[Seb33300]

Hello,

I am not very comfortable with command line and I was wondering why in some cases you write:

composer require --dev bundle-name

And on some other cases:

composer require bundle-name --dev

It also concern yarn command lines:
https://github.com/symfony/symfony-docs/search?p=1&q=--dev&unscoped_q=--dev

Since it could be confusing for beginners or non-friendly command-line people like me, I suggest to keep consistency and always use the same order.

I will suggest to use composer require --dev bundle-name syntax since it sounds closer to the related composer require-dev option.

I can provide a pull request if 👍

[Seb33300]

@javiereguiluz was faster 👍

[javiereguiluz]

@Seb33300 I'm sorry for not having let you prepare this PR. The reason is that this kind of PRs usually generate conflicts so I wanted to give it a try to estimate the conflicts. It was much better than expected, so I created the PR. Thanks.

[javiereguiluz]

Fixed by #10938.