UI: Remove leading slash from kv version 2 secret path

[hellobontempo]

Typically we avoid sanitizing in the UI to minimize data manipulation, however we decided to strip secret paths of the leading slash to copy CLI functionality.

 vault kv put -mount=kv /my-secret foo=my-long-passcode
== Secret Path ==
kv/data/my-secret

======= Metadata =======
Key                Value
---                -----
created_time       2024-03-11T16:59:42.502882Z
custom_metadata    <nil>
deletion_time      n/a
destroyed          false
version            1
⇒ vault kv put -mount=kv //my-secret foo=my-long-passcode
== Secret Path ==
kv/data/my-secret

======= Metadata =======
Key                Value
---                -----
created_time       2024-03-11T17:00:01.047652Z
custom_metadata    <nil>
deletion_time      n/a
destroyed          false
version            2

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CI Results:
All Go tests succeeded! ✅

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Build Results:
All builds succeeded! ✅

[hashishaw]

:chefs-kiss: