[DX] Make configurable include post rector classes in result

[samsonasik]

@TomasVotruba per discussion on #7365 (comment)

This is make configurable in case you want to consider it, this is default to false so user needs to enable it in the config, via:

$rectorConfig->includePostRectorsInReports(true);

or

return RectorConfig::configure()
      // ...
     ->withIncludePostRectorsInReports(true);

/cc @simonschaufi

[samsonasik]

All checks have passed 🎉 @TomasVotruba it is ready for review.

[TomasVotruba]

As I wrote, I want to keep post Rectors as internal separated feature and keep configuration to minimum to make it readable. Adding off/on option here and there would turn into choice paralysis mess.

[simonschaufi]

😢 I'm sad about this decision. Post rectors still change code and are not just an internal rector thing