Upgrade to doctrine/coding-standard 10

[greg0ire]

This reverts commit 2393612.

[morozov]

As for the long strings, in some languages using concatenation to declare a long string in order to satisfy the coding standard is frowned upon since it makes the string harder to search in the code.

I'm curious if the standard could make an exception for such string (e.g. it's the only token on the line excluding whitespace and comma).

[greg0ire]

For the record, I think we should use linebreaks in messages a bit more, one reason being it would make us feel a bit more free to write longer messages with more details. I don't know how the cs rule about line breaks is implemented, but I'd be surprised if it involved a parser.

Since the source code and the messages are both read by humans, it would make sense to make the messages legible by having linebreaks at some point. Using unindented nowdoc might allow having the same line length limit, except in situations where the message is used in an HTML without the linebreaks being transformed to <br/>. I'd be curious to know what presentation layers out there currently treat linebreaks.