tools/wpt/wptrunner crashes on Python 3.13 with a custom entry point. #58984
Description
If you add a custom entry point to a package so that wptrunner can access it and install a new (external)
test harness, under 3.13, the get_all_products() code in //tools/wptrunner/wptrunner/products.py will
crash with a KeyError.
This appears to be due to an upgrade in 3.13 to a new version of importlib.metadata that changed
the definition of the EntryPoints class to something that didn't support access by index, only by name.
There are various simple fixes available; anything that converts EntryPoints from a dict-like thing to a
list-like thing should work. A cast to a list works, for example.