Function resolve_specifier_into_node_modules 

pub fn resolve_specifier_into_node_modules(
    sys: &impl FsCanonicalize,
    specifier: &Url,
) -> Url

Resolves a specifier that is pointing into a node_modules folder.

Note: This should be called whenever getting the specifier from a Module::External(module) reference because that module might not be fully resolved at the time deno_graph is analyzing it because the node_modules folder might not exist at that time.