dillon1000/react

[react-devtools-shared] Added string type check for object name prop in getDisplayName function (#16798)

* [react-devtools-shared] Added string type check for object name prop in getDisplayName function from utils.js file; tests included;

* Re-added empty string check to getDisplayName()

* Tweaked tests to use real functions

This more closely simulates how the utility is being used in production, and would catch cases like anonymous functions (with empty string names).