Backport of UI: Add version 1 if KV engine has no version data into release/1.15.x

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

Backport

This PR is auto-generated from #23585 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.

---

Fixes #23463

When a user enables KV in the UI we default to version 2 by passing the version in the options object.

A kv v1 engine is mounted if no version flag is used when enabling kv using the CLI. This is unclear on the READ request because there is no version information in the options key (see below). This PR updates the UI logic so that if no version information exists, the UI assumes it is version 1.

$ vault secrets enable  kv

$ curl   
    --header "X-Vault-Token: root" \
    http://127.0.0.1:8200/v1/sys/mounts | jq
⇒
  "request_id": "fdf6549f-c136-c288-81e5-5e02993ad6c3",
  "lease_id": "",
  "renewable": false,
  "lease_duration": 0,
  "data": {
    "kv-test/": {
      "accessor": "kv_4396c4ae",
      "config": {
        "default_lease_ttl": 0,
        "force_no_cache": false,
        "max_lease_ttl": 0
      },
      "deprecation_status": "supported",
      "description": "",
      "external_entropy_access": false,
      "local": false,
      "options": null, //  <= no version information
      "plugin_version": "",
      "running_plugin_version": "v0.16.1+builtin",
      "running_sha256": "",
      "seal_wrap": false,
      "type": "kv",
      "uuid": "b0306a4d-01da-23dc-c734-925d6e72a579"
    }
 }

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  - feeda224c8a288c0218f36a5b23fc12b06c1f188 

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