False Positive StringToClassRule

[keywan-ghadami-oxid]

StringToClassRule reports fails positive for a string containing "Error" in my application.

Maybe this rule is not that important anymore because phpstan can report using string where class-string is expected.

A good compromise to reduce chance of fail positives would be to check only for full qualified class names in strings.

[Slamdunk]

Any PR is welcome 👍