[ChangesReporting][Alternative] Collect changed_files on --no-diffs with json output with use of JsonOutputFactory

[samsonasik]

to make easy test for cross OS usage.

Continue of PR:

• Fixes showing files changed in JSON formatter #7808

Closes #7808

[samsonasik]

@peterfox on running via cli, it somehow not show the list of file changed (even your original PR).

➜  rector-src git:(use-factory) ✗ bin/rector process src/Application/VersionResolver.php  --output-format=json --no-diffs  --dry-run
{
    "totals": {
        "changed_files": 1,
        "errors": 0
    }
}

so it seems need change on FileProcessor or ApplicationFileProcessor level to append "empty file diffs"

I will look more, mark as draft for now :)