[Target size]: UA controlled rule

[Jym77]

⚠️ THIS PR MAKES LITTLE SENSE IN ISOLATION ⚠️

Since #2167 is getting way too big, and according to CG call on April 11th, trying to extract the atomic rules to see if it can ease review. This is an isolated rule for the larger "Target Size" rules. This rule alone makes little sense (as in, not checking anything valuable), please consider the bigger picture of #2167 while reviewing.

Closes issue(s):

• N/A

Need for Call for Review: This will require a 2 weeks Call for Review (new rule)

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