Generate Notice when error_reporting mode is completely disabled

Description

It's quite common, especially among beginners, to be confused about seemingly ok code not performing anything at all while also not generating any error. The issue may be that either the configuration has set error_reporting to 0 or that their own code contains error_reporting(0). While some might say that there could be valid use cases to have this in a production code, I'd prefer that the language didn't encourage this. For this reason, I think it would be a good idea to generate a Notice whenever error_reporting(0) is used or during PHP startup if INI config contains error_reporting=0. A Notice is generally not considered an error, but rather an informational message. It could reduce some confusion among beginner PHP programmers.

まず、error_reporting(0) の処理と、INI 設定 error_reporting を読み取る PHP の起動パスを追跡します。それぞれの場合に Notice がどのように生成されるか、また既存のどの動作やテストがこれらのエントリポイントを対象としているかを確認します。明示的な error_reporting(0) の呼び出しと error_reporting=0 での起動の両方で、意図した Notice が生成されれば完了です。