[compiler] Make inserting outlined functions more resilient

To handle more cases, always append the synthetic outlined function as a
new child of the module rather than make assumptions about the original
function. This should handle whatever case where the original function
expression may be a child of a variety of parents

ghstack-source-id: 8581edb8be706c0f4ce506caf7cd9b0f5a145bc8
Pull Request resolved: https://github.com/facebook/react/pull/30466