Update utilize rule to warning level suggestion

What does this MR do?

As the TW Testing team discussed recently, we probably should have rules that can clearly always be resolved with the suggested text at the warning level.

It seemed like utilize can be avoided entirely. After looking at the docs, it seems like the 15'ish examples could all be changed to use, which means the rule can go to warning level at least.

I went ahead and cleaned them all up as well, which means the rule could actually go to the error level, but let's start with warning which is the MVC, I think.

Related issues

Related to #284058 (closed)

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