UI: allow navigation to subdirectory

[hellobontempo]

This partially fixes the request here #5362 so users can LIST at the secret level in the UI.

Fixes #20563 and #13188 and #20563

The user in the gif has the following policy where they can only LIST at the my-secret/ level. Previously a user had to know the full secret path to view this list of secrets, now they just need the top-level secret path:

path "my-kv/metadata/my-secret/*" { capabilities = ["list", "read"] }
path "my-kv/data/my-secret/*" { capabilities = ["list", "read"] }

---

If a user can only list metadata at the top level, so with a policy that looks something like:

path "my-kv/data/*" {
  capabilities = ["read", "list", "delete"]
}
path "my-kv/metadata" {
  capabilities = ["list"]
}

The input in the card pre-fills with the path selected from the list view

[github-actions]

Build Results:
All builds succeeded! ✅

[hellobontempo]

Approvals were on different branch/PR #22436