Bug fix for double slash in LIST endpoint

[Monkeychip]

This UI only regression bug was potentially introduced by this PR.

The reproduction steps of how the bug was reported:

1. on a binary
2. Create a namespace
3. Within the namespace mount the auth method userpass.
4. Create a user userpass and navigate to the list view. No users would show and there was a 301 followed by a 404 error on the network request on this LIST endpoint. if you look closely, you'll see a double forward slash.
   http://localhost:4200/v1/auth/userpass/users//?list=true

This fix cleans out the double forward slash and resolves the issue. The sanitizePath method removes any whitespace and trailing and leading slashes.

TODO:

• test to make sure doesn't break anything ✅
• run enterprise tests locally. ✅

[github-actions]

CI Results:
All Go tests succeeded! ✅

[github-actions]

Build Results:
All builds succeeded! ✅

[hellobontempo]

Nice job tracking this down! 🕵️