Fixing Hashi Vault integration test

[draychev]

Two recent PRs introduced a compilation error, which is failing on main. This was caused by a semantic merge conflict, which did not break on the individual PRs.

1. Introduced a change to a type: https://github.com/openservicemesh/osm/pull/2074/files#diff-e7b3046705df4aa3c3cf672ccbb4860037655b8bb52d87adbdd53383d9ac0a64R23
2. Introduced a new test using the old type: https://github.com/openservicemesh/osm/pull/2069/files#diff-a262c8109d371baa7fc9661024a7d4b8099a24d4954efccc8862dd4d3501c515R112

The PR here fixes the test (2), which must use the new type (1).

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Affected area:

• New Functionality [ ]
• Documentation [ ]
• Install [ ]
• Control Plane [ ]
• CLI Tool [ ]
• Certificate Management [ ]
• Networking [ ]
• Metrics [ ]
• SMI Policy [ ]
• Security [ ]
• Tests [ ]
• CI System [ ]
• Performance [ ]
• Other [ ]

Please answer the following questions with yes/no.

• Does this change contain code from or inspired by another project? If so, did you notify the maintainers and provide attribution?