Exclude INSIGHT_RULE_METRIC from CloudWatch:Math:UnknownIdentifier warning

[aws-sde]

The CloudWatch MathExpression class warns about identifiers missing from usingMetrics when INSIGHT_RULE_METRIC is used in the expression. It incorrectly parses the arguments to INSIGHT_RULE_METRIC as identifiers. When using INSIGHT_RULE_METRIC, I don't believe there is anything that needs to be added to usingMetrics.

This implementation follows a similar fix done for some other expressions here: #24313

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