Backport of Bug fix for double slash in LIST endpoint into release/1.15.x

[hc-github-team-secure-vault-core]

Backport

This PR is auto-generated from #23446 to be assessed for backporting due to the inclusion of the label backport/1.15.x.

The below text is copied from the body of the original PR.

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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. ✅

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Name	Status	Preview	Comments	Updated (UTC)
vault	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 2, 2023 8:43pm

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