Ensure accurate root_path removal in get_route_path function

[gabriel-f-santos]

Issue: #2599
Discussion: #2495

Summary

Change regex used to remove root_path to consider only the root path without match simillar endpoint that contains the root_path as substring.
ex:

root_path = "product"
scope["path"] = "products/all"

before:

re.sub(r"^" + root_path, "", scope["path"]) -> 's/all'

after:

re.sub(r"^" + root_path + r"(?=/|$)", "", scope["path"]) -> '/products/all'

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.

[Kludex]

Is there a way we can use removeprefix instead?