Require code in internal API for logging Warns/Errors

[JanKrivanek]

Context

Suggested by @Nirmal4G here #10388 (comment)

With Code specified in the targets, we can just do a text search on a preprocessed file, and we can go to that exact line. This saves a ton of time combing through binlog or imported files.

And if you want to indicate the Code mapping in RESX, why not add it in the comments? There's a reason that previous text only message tasks had a separate Code parameter instead of just putting them in the Text parameter.

[JanKrivanek]

Team triage: not meeting the bar for investment

[Nirmal4G]

Okay. "Investment" is a big word for such a simple refactor of an API where any other team is yet to consume.

As I said before, the benefits outweigh the maintenance cost if any already.