Passing error_formatter in new_messages method of Error Class

[Daksh2000]

Fixes: #18713

Problem -
When user runs dmypy for a file once (with flag output=json) , it gave correct validation error (in form of json)
But when user changes something in file and then runs the same command again , it does give error in json format because
since the daemon is running now , the code flow goes to print out errors without error_formatter set

Solution -
I passed formatter to new_messages of Errors Class (with default value None), so that when FineGrainedBuildManager is called again , it will have BuildManager associated with it and which will have the error_formatter set (if it was set intially while running daemon).

[Daksh2000]

Fixes: #18713

Problem - When user runs dmypy for a file once (with flag output=json) , it gave correct validation error (in form of json) But when user changes something in file and then runs the same command again , it does give error in json format because since the daemon is running now , the code flow goes to print out errors without error_formatter set

Solution - I passed formatter to new_messages of Errors Class (with default value None), so that when FineGrainedBuildManager is called again , it will have BuildManager associated with it and which will have the error_formatter set (if it was set intially while running daemon).

[github-actions]

According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅